Compare the2025 Porsche Cayenne CoupeVS 2025 Mercedes GLC Coupe

Both the Cayenne Coupe and GLC Coupe have child safety locks to prevent children from opening the rear doors. The Cayenne Coupe has power child safety locks, allowing the driver to activate and deactivate them from the driver's seat and to know when they're engaged. The GLC Coupe’s child locks have to be individually engaged at each rear door with a manual switch. The driver can’t know the status of the locks without opening the doors and checking them.

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 GLC Coupe 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 GLC Coupe doesn’t offer a night vision system.

The Cayenne Coupe’s standard lane departure warning system alerts a temporarily inattentive driver when the vehicle begins to leave its lane and gently nudges the vehicle back towards its lane. A lane departure warning system costs extra on the GLC Coupe.

Both the Cayenne Coupe and the GLC Coupe have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, front seatbelt pretensioners, height adjustable front shoulder belts, four-wheel antilock brakes, all wheel drive, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, post-collision automatic braking systems, daytime running lights, blind spot warning systems, around view monitors, rear cross-path warning and driver alert monitors.

The Porsche Cayenne Coupe weighs 452 to 1431 pounds more than the Mercedes GLC Coupe. 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 GLC Coupe’s (12 vs. 5 years).

J.D. Power and Associates rated the Cayenne Coupe second among upper midsize premium suvs in their 2024 Initial Quality Study. The GLC Coupe isn’t in the top three in its category.

J.D. Power and Associates’ 2024 Initial Quality Study of new car owners surveyed provide the statistics that show that Porsche vehicles are better in initial quality than Mercedes vehicles. J.D. Power ranks Porsche above average in initial quality. With 34 more problems per 100 vehicles, Mercedes is rated below average.

J.D. Power and Associates’ 2024 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 15 more problems per 100 vehicles in the first three years of ownership, Mercedes is rated below average.

From surveys of all its subscribers, Consumer Reports’ January 2024 Auto Issue reports that Porsche vehicles are more reliable than Mercedes vehicles. Consumer Reports ranks Porsche 21 places higher in reliability than Mercedes.

The Cayenne Coupe’s standard 3.0 turbo V6 produces 93 more horsepower (348 vs. 255) and 73 lbs.-ft. more torque (368 vs. 295) than the GLC Coupe’s 2.0 turbo 4-cylinder hybrid. The Cayenne E-Hybrid Coupe’s standard 3.0 turbo V6 hybrid produces 208 more horsepower (463 vs. 255) and 184 lbs.-ft. more torque (479 vs. 295) than the GLC Coupe’s 2.0 turbo 4-cylinder hybrid. The Cayenne S Coupe’s standard 4.0 turbo V8 produces 213 more horsepower (468 vs. 255) and 147 lbs.-ft. more torque (442 vs. 295) than the GLC Coupe’s 2.0 turbo 4-cylinder hybrid. The Cayenne GTS Coupe’s standard 4.0 turbo V8 produces 238 more horsepower (493 vs. 255) and 191 lbs.-ft. more torque (486 vs. 295) than the GLC Coupe’s 2.0 turbo 4-cylinder hybrid. The Cayenne Turbo E-Hybrid Coupe’s standard 4.0 turbo V8 hybrid produces 474 more horsepower (729 vs. 255) and 405 lbs.-ft. more torque (700 vs. 295) than the GLC Coupe’s 2.0 turbo 4-cylinder hybrid.

The Cayenne Coupe E-Hybrid’s standard fuel tank has 2 gallons more fuel capacity than the GLC Coupe (18.4 vs. 16.4 gallons), for longer range between fill-ups. The Cayenne Coupe’s standard fuel tank has 7.3 gallons more fuel capacity than the GLC Coupe (23.7 vs. 16.4 gallons).

The Cayenne Coupe’s optional launch control uses engine electronics to hold engine RPM’s precisely in order to provide the most stable and rapid acceleration possible, using all of the available traction. The GLC Coupe doesn’t offer launch control.

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

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 GLC Coupe 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 GLC Coupe doesn’t offer air brakes.

For better traction, the Cayenne Coupe has larger standard tires than the GLC Coupe (F:255/55R20 & R:295/45R20 vs. 235/55R19). The Cayenne Coupe’s optional tires are larger than the largest tires available on the GLC Coupe (F:285/45R21 & R:315/40R21 vs. F:255/45R20 & R:285/40R20).

The Cayenne Coupe’s standard 295/45R20 rear tires provide better handling because they have a lower 45 series profile (height to width ratio) that provides a stiffer sidewall than the GLC Coupe’s standard 55 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 GLC Coupe. The Cayenne Coupe’s optional 22-inch wheels are larger than the 21-inch wheels optional on the GLC Coupe.

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 GLC Coupe 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 GLC Coupe.

The Cayenne Coupe 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 GLC Coupe’s suspension doesn’t offer adjustable shock absorbers.

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

For better maneuverability, the Cayenne Turbo GT’s turning circle is .7 feet tighter than the GLC Coupe’s (38 feet vs. 38.7 feet).

For greater off-road capability the Cayenne E-Hybrid Coupe has a 3.1 inches greater minimum ground clearance than the GLC Coupe (8.2 vs. 5.1 inches), allowing the Cayenne Coupe to travel over rougher terrain without being stopped or damaged. The Cayenne Turbo E-Hybrid Coupe’s minimum ground clearance is 1.3 inches higher than on the GLC Coupe (9.5 vs. 8.2 inches).

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 GLC Coupe doesn’t offer active grille shutters.

The Cayenne Coupe has .4 inches more front legroom, 1.8 inches more front shoulder room, 2.8 inches more rear legroom and .7 inches more rear shoulder room than the GLC Coupe.

The Cayenne Coupe has a much larger cargo volume with its rear seat up than the GLC Coupe with its rear seat up (20.9 vs. 19.2 cubic feet). The Cayenne Coupe has a much larger cargo volume with its rear seat folded than the GLC Coupe with its rear seat folded (53 vs. 52.6 cubic feet).

The Cayenne Coupe’s standard towing capacity is much higher than the GLC Coupe’s (7716 vs. 3500 pounds).

A trailer sway control is standard on the Cayenne Coupe, using 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. A trailer sway program costs extra on the GLC Coupe.

J.D. Power and Associates surveys of service recipients show that Porsche service is better than Mercedes. J.D. Power ranks Porsche second in service department satisfaction. With a 36% lower rating, Mercedes is ranked 17th.

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 GLC Coupe 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 GLC Coupe 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 GLC Coupe 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 GLC Coupe doesn’t offer rear side window sunshades.

The Cayenne Coupe has a standard heated steering wheel to take the chill out of steering on extremely cold winter days before the vehicle heater warms up. A heated steering wheel costs extra on the GLC Coupe.

The Cayenne Coupe offers optional massaging front seats in order to maximize comfort and eliminate fatigue on long trips. Massaging seats aren’t available in the GLC Coupe.

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

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