Compare the2025 Mercedes GLSVS 2024 Subaru Ascent

Safety
Warranty
Engine
Fuel Economy and Range
Brakes and Stopping
Tires and Wheels
Suspension and Handling
Cargo Capacity
Towing
Servicing Ease
Ergonomics
Economic Advantages
Recommendations

Safety

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The GLS’ pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The Ascent doesn’t offer pre-crash pretensioners.

The GLS offers an optional Post Collision Brake, which automatically applies the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The Ascent doesn’t offer a post collision braking system: in the event of a collision that triggers the airbags, more collisions are possible without the protection of airbags that may have already deployed.

Earlier warning of stopped traffic, traffic signals, dangerous road conditions, weather, or accidents, can keep driver's safer and prevent crashes. The GLS has Car-to-X Communication, a system that seamlessly communicates important warnings to the driver about impending danger, if they're available. The Ascent doesn’t offer a system that can receive automated systems from infrastructure or other vehicles.

The GLS has a standard blind spot warning system that uses sensors to alert the driver to objects in the vehicle’s blind spots where the side view mirrors don’t reveal them and moves the vehicle back into its lane. Only the Ascent Premium/Onyx/Limited/Touring offers a blind spot warning system.

To help make backing out of a parking space safer, the GLS has standard Rear Cross-Traffic Alert and Active Brake Assist automatically engages the brakes to help avoid a collision. Only the Ascent Premium/Onyx/Limited/Touring offers Rear Cross Traffic Alert and the Ascent’s Rear Cross Traffic Alert does not include automatic braking.

Both the GLS and the Ascent have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, front and rear seatbelt pretensioners, height adjustable front shoulder belts, plastic fuel tanks, four-wheel antilock brakes, all wheel drive, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, lane departure warning systems and rearview cameras.

The Mercedes GLS weighs 955 to 1799 pounds more than the Subaru Ascent. The NHTSA advises that heavier vehicles are much safer in collisions than their significantly lighter counterparts.

Warranty

The GLS comes with a full 4-year/50,000-mile basic warranty, which covers the entire truck and includes 24-hour roadside assistance. The Ascent’s 3-year/36,000-mile basic warranty expires 1 year or 14,000 miles sooner.

Engine

The GLS 450’s standard 3.0 turbo 6-cylinder hybrid produces 115 more horsepower (375 vs. 260) and 92 lbs.-ft. more torque (369 vs. 277) than the Ascent’s 2.4 turbo 4-cylinder. The GLS 580’s standard 4.0 turbo V8 hybrid produces 250 more horsepower (510 vs. 260) and 261 lbs.-ft. more torque (538 vs. 277) than the Ascent’s 2.4 turbo 4-cylinder. The Maybach GLS 600’s standard 4.0 turbo V8 hybrid produces 290 more horsepower (550 vs. 260) and 261 lbs.-ft. more torque (538 vs. 277) than the Ascent’s 2.4 turbo 4-cylinder.

As tested in Motor Trend the GLS 450 3.0 turbo 6-cylinder hybrid is faster than the Subaru Ascent:

	GLS	Ascent
Zero to 60 MPH	5.5 sec	7.5 sec
Quarter Mile	14 sec	16 sec
Speed in 1/4 Mile	99.8 MPH	88.6 MPH

Fuel Economy and Range

Regenerative brakes improve the GLS’ fuel efficiency by converting inertia back into energy instead of wasting it. The Ascent doesn’t offer a regenerative braking system.

In heavy traffic or at stoplights the GLS’ engine automatically turns off when the vehicle is stopped, saving fuel and reducing pollution. The engine is automatically restarted when the driver gets ready to move again. If the conditions warrant or the driver wishes, the system can be manually disabled at any time for the duration of a trip. The Ascent doesn’t offer an automatic engine start/stop system.

The GLS has 4.5 gallons more fuel capacity than the Ascent (23.8 vs. 19.3 gallons), for longer range between fill-ups.

Brakes and Stopping

For better stopping power the GLS’ brake rotors are larger than those on the Ascent:

	GLS	Ascent
Front Rotors	14.8 inches	13.1 inches
Rear Rotors	13.6 inches	13 inches

The GLS stops much shorter than the Ascent:

	GLS	Ascent
70 to 0 MPH	154 feet	179 feet	Car and Driver
60 to 0 MPH	107 feet	125 feet	Motor Trend

Tires and Wheels

For better traction, the GLS has larger standard tires than the Ascent (F:275/45R21 & R:315/40R21 vs. 245/60R18). The GLS’ optional tires are larger than the largest tires available on the Ascent (F:285/40R23 & R:325/35R23 vs. 245/60R18).

The GLS’ standard 275/45R21 front and 315/40R21 rear tires provide better handling because they have a lower 45 series front and 40 series rear profile (height to width ratio) that provides a stiffer sidewall than the Ascent’s standard 60 series tires. The GLS’ optional 285/40R23 front and 325/35R23 rear tires have a lower 40 series front and 35 series rear profile than the Ascent Onyx/Limited/Touring’s 50 series tires.

For better ride, handling and brake cooling the GLS has standard 21-inch wheels. Smaller 18-inch wheels are standard on the Ascent. The GLS’ optional 23-inch wheels are larger than the 20-inch wheels on the Ascent Onyx/Limited/Touring.

Suspension and Handling

The GLS has standard front and rear gas-charged shocks for better control over choppy roads. The Ascent’s suspension doesn’t offer gas-charged shocks.

The front and rear suspension of the GLS uses air springs for a smoother, controlled ride than the Ascent, which uses coil springs. Air springs maintain proper ride height and ride more smoothly.

The GLS offers an available adjustable active suspension system, which counteracts cornering forces actively, limiting body roll and improving handling and stability. Subaru doesn’t offer an active suspension on the Ascent.

The GLS has a standard driver-adjustable suspension system. It allows the driver to choose between an extra-supple ride, reducing fatigue on long trips, or a sport setting, which allows maximum control for tricky roads or off-road. The Ascent’s suspension doesn’t offer adjustable shock absorbers.

The GLS has a standard automatic front and rear load leveling suspension to keep ride height level with a heavy load or when towing. The GLS’ height leveling suspension allows the driver to raise ride height for better off-road clearance and then lower it again for easier entering and exiting and better on-road handling. The Ascent doesn’t offer a load leveling suspension.

The GLS has vehicle speed sensitive variable-assist power steering, for low-effort parking, better control at highway speeds and during hard cornering, and a better feel of the road. The Ascent doesn’t offer variable-assist power steering.

The GLS’ drift compensation steering can automatically compensate for road conditions which would cause the vehicle to drift from side to side, helping the driver to keep the vehicle straight more easily. The Ascent doesn’t offer drift compensation steering.

For a smoother ride and more stable handling, the GLS’ wheelbase is 9.6 inches longer than on the Ascent (123.4 inches vs. 113.8 inches).

For better handling and stability, the average track (width between the wheels) on the GLS is 2.2 inches wider in the front and 3.3 inches wider in the rear than the track on the Ascent.

The GLS’ front to rear weight distribution is more even (52% to 48%) than the Ascent’s (54.2% to 45.8%). This gives the GLS more stable handling and braking.

The GLS 450 handles at .92 G’s, while the Ascent Limited pulls only .79 G’s of cornering force in a Car and Driver skidpad test.

The Maybach GLS 600 executes Motor Trend’s “Figure Eight” maneuver quicker than the Ascent Touring (26.5 seconds @ .69 average G’s vs. 27.4 seconds @ .63 average G’s).

For better maneuverability, the Maybach GLS 600’s turning circle is 2.3 feet tighter than the Ascent’s (35.7 feet vs. 38 feet).

For greater off-road capability the GLS has a 1.4 inches greater minimum ground clearance than the Ascent (10.1 vs. 8.7 inches), allowing the GLS to travel over rougher terrain without being stopped or damaged. The GLS Off-Road Package’s minimum ground clearance is 2.6 inches higher than on the Ascent (11.3 vs. 8.7 inches).

Cargo Capacity

The GLS’ cargo area provides more volume than the Ascent.

	GLS	Ascent
Second Seat Folded	84.7 cubic feet	75.6 cubic feet

The GLS has a standard third row seat which folds flat into the floor. This completely clears a very large cargo area quickly. The Ascent doesn’t offer seats that fold into the floor.

Pressing a switch automatically lowers or raises the GLS’ second and third row seats, to make changing between cargo and passengers easier. The Ascent doesn’t offer automatic folding seats.

To make loading groceries and cargo easier when your hands are full, the GLS’ liftgate can be opened and closed just by kicking your foot under the back bumper, leaving your hands completely free. The Ascent doesn’t offer a hands-free gesture to open its liftgate, forcing you to put cargo down if your hands are full.

Towing

The GLS’ standard towing capacity is much higher than the Ascent’s (7700 vs. 2000 pounds).

Servicing Ease

The GLS uses gas struts to support the hood for easier service access. The Ascent uses a prop rod to support its heavy hood. It takes two hands to open the hood and set the prop rod, the prop rod gets in the way during maintenance and service, and the prop rod could be knocked out, causing the heavy hood to fall on the person maintaining or servicing the car.

Ergonomics

Unlike the driver-only memory seat in the Ascent Limited/Touring, the GLS has standard driver and passenger memory, so that when drivers switch, the memory setting adjusts the driver’s seat, steering wheel position, suspension setting, power steering assist, outside mirror angle, climate settings and radio stations and the front passenger seat also adjusts to the new passenger’s preset preferences.

The GLS’ standard easy entry system raises the steering wheel and glides the driver’s seat back, making it easier for the driver to get in and out. The Ascent doesn’t offer an easy entry system.

The GLS offers an optional heads-up display that projects speed, navigation instruction and driver assistance information readouts in front of the driver’s line of sight, allowing drivers to view information without diverting their eyes from the road. The Ascent doesn’t offer a heads-up display.

The power windows standard on both the GLS and the Ascent have locks to prevent small children from operating them. When the lock on the GLS is engaged the driver can still operate all of the windows, for instance to close one opened by a child. The Ascent prevents the driver from operating the other windows just as it does the other passengers.

The GLS’ front and rear power windows all open or close fully with one touch of the switches, making it more convenient at drive-up windows and toll booths, or when talking with someone outside the car. The Ascent’s rear power window switches have to be held the entire time to open or close them fully.

If the windows are left open on the GLS the driver can close them all at the outside door handle or from a distance using the remote (remote must be aimed at door sensor). On a hot day the driver can lower the windows from a distance using the keyless remote. The driver of the Ascent can only operate the windows from inside the vehicle, with the ignition on.

The GLS’ standard Keyless-Go allow you to unlock the doors from any outside door handle, open the cargo door, and start the engine, all without removing the key from the pocket or purse. Keyless Access and Start is an extra cost option on the Ascent and doesn’t offer a sensor on the rear doors, so you’ll have to reach a front handle to unlock the rear door. Keyless Access and Start is not available on the Ascent Base.

The GLS’ rain-sensitive wipers adjust their speed and turn on and off automatically based on the amount of rainfall on the windshield. This allows the driver to concentrate on driving without constantly adjusting the wipers. The Ascent’s standard manually variable intermittent wipers have to be constantly adjusted.

Heated windshield washer fluid is optional on the GLS to defrost the washer nozzles and quickly clear ice and frost from the windshield without scraping. The Ascent doesn’t offer heated windshield washer fluid.

To better shield the driver and front passenger’s vision, the GLS has standard dual-element sun visors that can block glare from two directions simultaneously. The Ascent doesn’t offer secondary sun visors.

The GLS’ standard outside mirrors include heating elements to clear off the mirrors for better visibility. Subaru only offers heated mirrors on the Ascent Premium/Onyx/Limited/Touring.

When the GLS is put in reverse, the passenger rearview mirror tilts from its original position. This gives the driver a better view of the curb during parallel parking maneuvers. Shifting out of reverse puts the mirror into its original position. The Ascent’s mirror doesn’t automatically adjust for backing.

The Mercedes GLS has power folding mirrors that offer unparalleled convenience while maneuvering in tight places or parked. With the mirrors folded it’s easier to walk past and help prevent parking damage. The mirrors can be quickly unfolded when the driver is ready to leave. Power folding mirrors costs extra on the Ascent and aren't offered on the Base/Premium.

The GLS has standard heated front and optional heated second and third row seats, which keep the driver and passengers extremely comfortable in the winter. Subaru doesn’t offer heated seats in the third row of the Ascent.

The GLS has standard front air conditioned seats and offers them optionally in the second row. This keeps the passengers comfortable and takes the sting out of hot seats in summer. The Ascent doesn’t offer air-conditioned seats for the second row.

The GLS offers an optional center folding armrest for the third row rear passengers. A center armrest helps make rear passengers more comfortable and can provide a barrier between children. The Ascent doesn’t offer a third row rear seat center armrest.

The GLS offers optional massaging front and second row seats, which keep the driver and middle row passengers. Massaging seats aren’t available in the Ascent.

The Mercedes GLS has a standard Homelink wireless remote control system for garage door operation and device management, conveniently located on the rear view mirror. Homelink® eliminates the need for separate garage door openers and associated risks of losing, breaking, or having dead batteries. Subaru charges extra for Homelink® on the Ascent.

To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the Mercedes GLS has a standard wireless phone charging system (Qi) in the center console. Wireless charging costs extra on the Ascent. The GLS also offers Qi charging in the second row seat. The Ascent doesn’t offer wireless charging in its second row seat.

The GLS’ Active Parking Assist can parallel park or back into a parking spot by itself, starting, stopping and changing direction automatically. The Ascent doesn’t offer an automated parking system.

Economic Advantages

According to The Car Book by Jack Gillis, the GLS is less expensive to operate than the Ascent because typical repairs cost less on the GLS than the Ascent, including $63 less for front struts.

Recommendations

J.D. Power and Associates rated the GLS third among large premium suvs in owner reported satisfaction. This includes how well the vehicle performs and satisfies its owner’s expectations. The Ascent isn’t in the top three.

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