2020 Porsche Cayenne Coupe vs. 2020 Mercedes AMG GLC Coupe

Detailed Review, Specifications & Comparison

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Safety

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The Cayenne Coupe has a standard Multi-collision Brake System, which automatically applies the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The AMG GLC Coupe 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.

When descending a steep, off-road slope, the Cayenne Coupe’s standard Porsche Hill Control allows you to creep down safely. The AMG GLC Coupe doesn’t offer Porsche Hill Control.

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 GLC Coupe doesn’t offer a night vision system.

Both the Cayenne Coupe and the AMG GLC Coupe 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.

Warranty

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

Reliability

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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 47 points higher than the AMG GLC Coupe.

J.D. Power and Associates’ 2019 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 second in reliability, above the industry average. With 26 more problems per 100 vehicles, Mercedes is ranked 13th.

From surveys of all its subscribers, Consumer Reports’ December 2019 Auto Issue reports that Porsche vehicles are more reliable than Mercedes vehicles. Consumer Reports ranks Porsche fourth in reliability. Mercedes is ranked 21st.

Engine

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The Cayenne Coupe has more powerful engines than the AMG GLC Coupe:

Horsepower

Torque

Cayenne S Coupe 2.9 turbo V6

434 HP

406 lbs.-ft.

Cayenne E-Hybrid Coupe 3.0 turbo V6

455 HP

516 lbs.-ft.

Cayenne Turbo Coupe 4.0 turbo V8

541 HP

568 lbs.-ft.

Cayenne Turbo S E-Hybrid Coupe 4.0 turbo V8

670 HP

663 lbs.-ft.

AMG GLC 43 Coupe 3.0 turbo V6

385 HP

384 lbs.-ft.

AMG GLC 63 Coupe 4.0 turbo V8

469 HP

479 lbs.-ft.

AMG GLC 63 S Coupe 4.0 turbo V8

503 HP

516 lbs.-ft.

Fuel Economy and Range

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

MPGe

Cayenne Coupe

Electric Motor

45 city/37 hwy

AMG GLC Coupe

MPG

43 3.0 turbo V6

18 city/24 hwy

63 4.0 turbo V8

16 city/22 hwy

63 S 4.0 turbo V8

16 city/22 hwy

The Cayenne Turbo S E-Hybrid Coupe can drive on battery power alone for up to 31 miles. The AMG GLC Coupe must run its internal combustion engine to move.

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

The Cayenne Coupe E-Hybrid’s standard fuel tank has 2.4 gallons more fuel capacity than the AMG GLC Coupe (19.8 vs. 17.4 gallons), for longer range between fill-ups. The Cayenne Coupe’s standard fuel tank has 6.3 gallons more fuel capacity than the AMG GLC Coupe (23.7 vs. 17.4 gallons).

Brakes and Stopping

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

Cayenne S

Cayenne Turbo

Cayenne opt.

AMG GLC 43

AMG GLC 63 S

Front Rotors

15.4 inches

16.3 inches

17.3 inches

14.2 inches

15.8 inches

Rear Rotors

13 inches

14.4 inches

16.1 inches

12.6 inches

14.2 inches

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 GLC Coupe doesn’t offer air brakes.

Tires and Wheels

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For better traction, the Cayenne Coupe has larger standard tires than the AMG GLC Coupe (F:275/45R20 & R:305/40R20 vs. F:255/45R20 & R:285/40R20). The Cayenne Coupe’s optional tires are larger than the largest tires available on the AMG GLC Coupe (F:285/40R21 & R:315/35R21 vs. F:265/45R20 & R:295/40R20).

The Cayenne Coupe’s optional 285/35R22 front and 315/30R22 rear tires provide better handling because they have a lower 35 series front and 30 series rear profile (height to width ratio) that provides a stiffer sidewall than the AMG GLC Coupe’s optional 40 series front and 35 series rear tires.

For better ride, handling and brake cooling the Cayenne Coupe offers optional 22-inch wheels. The AMG GLC Coupe’s largest wheels are only 21-inches.

Suspension and Handling

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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 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 AMG 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 AMG 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 AMG GLC Coupe doesn’t offer a load leveling suspension.

For greater off-road capability the Cayenne Coupe has a 2 inches greater minimum ground clearance than the AMG GLC 63 Coupe (8.2 vs. 6.2 inches), allowing the Cayenne Coupe to travel over rougher terrain without being stopped or damaged. The Cayenne Coupe Air Suspension’s minimum ground clearance is 3.2 inches higher than on the AMG GLC 63 S Coupe (9.6 vs. 6.4 inches).

Cargo Capacity

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The Cayenne Coupe has a much larger cargo volume with its rear seat up than the AMG GLC Coupe with its rear seat up (22 vs. 17.6 cubic feet). The Cayenne Coupe has a much larger cargo volume with its rear seat folded than the AMG GLC Coupe with its rear seat folded (54.3 vs. 49.4 cubic feet).

Towing

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The Cayenne Coupe’s standard towing capacity is much higher than the AMG GLC Coupe’s (7700 vs. 3500 pounds).

Servicing Ease

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J.D. Power and Associates surveys of service recipients show that Porsche service is better than Mercedes. J.D. Power ranks Porsche first in service department satisfaction. With a 23% lower rating, Mercedes is ranked fifth.

Ergonomics

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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 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 AMG GLC Coupe doesn’t offer headlight washers.

On extremely cold winter days, the Cayenne Coupe’s optional heated steering wheel provides comfort, allowing the driver to steer safely and comfortably before the vehicle heater warms up. The AMG GLC Coupe doesn’t offer a heated steering wheel.

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 AMG GLC Coupe.

Recommendations

© 1999 - 2020 Advanta-STAR Automotive Research. All rights reserved. This vehicle comparison and all of the content in it are provided only by license from Advanta-STAR Automotive Research Corporation of America. If you are not a legally licensed user of this vehicle comparison, it is against federal law to access it, copy it, forward it or use it in any manner whatsoever. Any unauthorized use of this vehicle comparison is a violation of U.S. and international law and is punishable criminally and civilly. 6IUEX-0KENZ 45.55.47.189 2020/08/13

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

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