Compare the2023 Porsche Cayenne CoupeVS 2023 Mercedes AMG GLB

The Porsche Cayenne Coupe has standard driver and front passenger side knee airbags mounted low on the dashboard. These airbags helps prevent the driver and front passenger from sliding under their seatbelts or the main frontal airbags; this keeps them better positioned during a collision for maximum protection. Knee airbags also help keep the legs from striking the dashboard, preventing knee and leg injuries in the case of a serious frontal collision. The AMG GLB doesn’t offer a front passenger side knee airbag.

A passive infrared night vision system optional on the Cayenne Coupe helps the driver to more easily detect people, animals or other objects in front of the vehicle at night. Using an infrared camera to detect heat, the system then displays the image on a monitor in the dashboard. The AMG GLB doesn’t offer a night vision system.

Both the Cayenne Coupe and the AMG GLB have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, height adjustable front shoulder belts, four-wheel antilock brakes, all wheel drive, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, rearview cameras, available lane departure warning systems, blind spot warning systems, around view monitors and rear cross-path warning.

The Porsche Cayenne Coupe weighs 794 to 1804 pounds more than the Mercedes AMG GLB. The NHTSA advises that heavier vehicles are much safer in collisions than their significantly lighter counterparts.

The Cayenne Coupe’s corrosion warranty is 7 years longer than the AMG GLB’s (12 vs. 5 years).

A reliable vehicle saves its owner time, money and trouble. Nobody wants to be stranded or have to be without a vehicle while it’s being repaired. Consumer Reports rates the Cayenne Coupe’s reliability 20 points higher than the AMG GLB.

J.D. Power and Associates’ 2022 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that Porsche vehicles are more reliable than Mercedes vehicles. J.D. Power ranks Porsche above average in long-term dependability. With 30 more problems per 100 vehicles in the first three years of ownership, Mercedes is rated below average.

The Cayenne Coupe’s standard 3.0 turbo V6 produces 33 more horsepower (335 vs. 302) and 37 lbs.-ft. more torque (332 vs. 295) than the AMG GLB’s 2.0 turbo 4-cylinder. The Cayenne S Coupe’s standard 2.9 turbo V6 produces 132 more horsepower (434 vs. 302) and 110 lbs.-ft. more torque (405 vs. 295) than the AMG GLB’s 2.0 turbo 4-cylinder. The Cayenne GTS Coupe’s standard 4.0 turbo V8 produces 151 more horsepower (453 vs. 302) and 162 lbs.-ft. more torque (457 vs. 295) than the AMG GLB’s 2.0 turbo 4-cylinder. The Cayenne E-Hybrid Coupe’s standard 3.0 turbo V6 hybrid produces 153 more horsepower (455 vs. 302) and 221 lbs.-ft. more torque (516 vs. 295) than the AMG GLB’s 2.0 turbo 4-cylinder. The Cayenne Turbo S E-Hybrid Coupe’s standard 4.0 turbo V8 hybrid produces 368 more horsepower (670 vs. 302) and 368 lbs.-ft. more torque (663 vs. 295) than the AMG GLB’s 2.0 turbo 4-cylinder.

On the EPA test cycle the Cayenne Coupe running on electricity gets better mileage than the AMG GLB:

The Cayenne Coupe can travel with zero emissions for 15 to 17 miles (dependent on model). The AMG GLB can’t move without running its internal combustion engine.

Regenerative brakes improve the Cayenne Coupe’s fuel efficiency by converting inertia back into energy instead of wasting it. The AMG GLB doesn’t offer a regenerative braking system.

The Cayenne Coupe E-Hybrid’s standard fuel tank has 3.9 gallons more fuel capacity than the AMG GLB (19.8 vs. 15.9 gallons), for longer range between fill-ups. The Cayenne Coupe’s standard fuel tank has 7.8 gallons more fuel capacity than the AMG GLB (23.7 vs. 15.9 gallons).

For better stopping power the Cayenne Coupe’s brake rotors are larger than those on the AMG GLB:

The Cayenne Coupe offers optional heat-treated ceramic brake rotors, which last ten to twenty times as long as conventional cast iron rotors, don’t rust, don’t fade during repeated high speed braking, and their lighter weight contribute to better braking, handling and acceleration. The AMG GLB doesn’t offer ceramic brake rotors.

The Cayenne Coupe Turbo has standard air brakes, which adjust the spoiler automatically during high-speed braking in order to shorten stopping distances. The AMG GLB doesn’t offer air brakes.

For better traction, the Cayenne Coupe has larger standard tires than the AMG GLB (F:275/45R20 & R:305/40R20 vs. 235/50R19). The Cayenne Coupe’s optional tires are larger than the largest tires available on the AMG GLB (F:285/40R21 & R:315/35R21 vs. 255/40R20).

The Cayenne Coupe’s standard 275/45R20 front and 305/40R20 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 AMG GLB’s standard 50 series tires. The Cayenne Coupe’s optional 315/30R22 rear tires have a lower 30 series profile than the AMG GLB’s optional 35 series tires.

For better ride, handling and brake cooling the Cayenne Coupe has standard 20-inch wheels. Smaller 19-inch wheels are standard on the AMG GLB. The Cayenne Coupe’s optional 22-inch wheels are larger than the 21-inch wheels optional on the AMG GLB.

The Cayenne Coupe has a standard space-saver spare (not available on E-Hybrid) so you can replace a flat tire and drive to have the flat repaired or replaced. A spare tire isn’t available on the AMG GLB; it requires you to depend on its run-flat tires, which limits mileage and speed before they are repaired. If a run-flat is damaged beyond repair by a road hazard your vehicle will have to be towed. Some tire options on the AMG GLB don’t have a run-flat feature, either.

The Cayenne Coupe has standard front and rear gas-charged shocks for better control over choppy roads. The AMG GLB’s suspension doesn’t offer gas-charged shocks.

The Cayenne Coupe offers active sway bars, which help keep it flat and controlled during cornering, but disconnect at lower speeds to smooth the ride and offer greater off-road suspension articulation. This helps keep the tires glued to the road on-road and off. The AMG GLB doesn’t offer an active sway bar system.

The Cayenne Coupe offers an available adjustable active suspension system, which counteracts cornering forces actively, limiting body roll and improving handling and stability. Mercedes doesn’t offer an active suspension on the AMG GLB.

The Cayenne Coupe has a standard automatic load leveling suspension to keep ride height level with a heavy load or when towing. The AMG GLB doesn’t offer a load leveling suspension.

For a smoother ride and more stable handling, the Cayenne Coupe’s wheelbase is 2.6 inches longer than on the AMG GLB (114 inches vs. 111.4 inches).

For better handling and stability, the average track (width between the wheels) on the Cayenne Coupe is 2.5 inches wider in the front and 3.4 inches wider in the rear than the track on the AMG GLB.

For better maneuverability, the Cayenne Coupe w/Rear Wheel Steering’s turning circle is 5.9 feet tighter than the AMG GLB’s (35.1 feet vs. 41 feet). The Cayenne Coupe’s turning circle is 1.2 feet tighter than the AMG GLB’s (39.8 feet vs. 41 feet).

The front grille of the Cayenne Coupe uses electronically controlled shutters to close off airflow and reduce drag when less engine cooling is needed. This helps improve highway fuel economy. The AMG GLB doesn’t offer active grille shutters.

The Cayenne Coupe has 3.2 inches more front shoulder room, 1.9 inches more rear legroom and 1.6 inches more rear shoulder room than the AMG GLB.

The Cayenne Coupe has a much larger cargo volume than the AMG GLB with its rear seat up (22 vs. 12.4 cubic feet).

The Cayenne Coupe has a 7700 lbs. towing capacity. The AMG GLB has no towing capacity.

Standard trailer sway control on the Cayenne Coupe uses the Porsche Stability Management sensors to detect trailer sway, then uses individual brakes to counteract any swaying and help keep the tow vehicle and trailer steady. The AMG GLB doesn’t offer electronic trailer sway control.

The engine in the Cayenne Coupe is mounted longitudinally (North-South), instead of sideways, as in the AMG GLB. This makes it easier to service and maintain, because the accessory belts are in front.

J.D. Power and Associates surveys of service recipients show that Porsche service is better than Mercedes. J.D. Power ranks Porsche third in service department satisfaction. With a 30% lower rating, Mercedes is ranked 18th.

The Cayenne Coupe’s instruments include an oil pressure gauge and a temperature gauge - which could save your engine! Often ‘idiot lights’ don’t warn you until damage has been done. The AMG GLB does not have an oil pressure gauge.

In poor weather, headlights can lose their effectiveness as grime builds up on their lenses. This can reduce visibility without the driver realizing. The Cayenne Coupe offers available headlight washers to keep headlight output high. The AMG GLB doesn’t offer headlight washers.

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

Manual rear side window sunshades are available in the Cayenne Coupe to help block heat and glare for the rear passengers. The AMG GLB doesn’t offer rear side window sunshades.

Both the Cayenne Coupe and the AMG GLB offer optional heated front seats. The Cayenne Coupe also offers optional heated rear seats to keep those passengers extremely comfortable in the winter. Heated second row seats aren’t available in the AMG GLB.

The Cayenne Coupe’s optional Active Park Assist can parallel park or back into a parking spot by itself, starting, stopping and changing direction automatically. Remote Park Assist will park and retrieve your car remotely: press a button and watch it park itself. This is ideal for tight locations. The AMG GLB’s automatic parking system does not offer parking by remote control.

The Cayenne Coupe will cost the buyer less in the long run because of its superior resale value. The IntelliChoice estimates that the Cayenne Coupe will retain 47.15% to 59.53% of its original price after five years, while the AMG GLB only retains 45.67%.

Consumer Reports® recommends the Porsche Cayenne Coupe, based on reliability, safety and performance.

J.D. Power and Associates rated the Cayenne Coupe third among upper midsize premium suvs in owner reported satisfaction. This includes how well the vehicle performs and satisfies its owner’s expectations. The AMG GLB isn’t in the top three.