Compare the2025 Mercedes AMG GLBVS 2024 Porsche Cayenne Coupe

The AMG GLB’s optional pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The Cayenne Coupe doesn’t offer pre-crash pretensioners.

The AMG GLB’s driver alert monitor detects an inattentive driver then sounds a warning and suggests a break. According to the NHTSA, drivers who fall asleep cause about 100,000 crashes and 1500 deaths a year. The Cayenne Coupe doesn’t offer a driver alert monitor.

Both the AMG GLB and the Cayenne 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, blind spot warning systems, rearview cameras, rear cross-path warning and available lane departure warning systems.

There are almost 2 times as many Mercedes dealers as there are Porsche dealers, which makes it much easier should you ever need service under the AMG GLB’s warranty.

On the EPA test cycle the AMG GLB gets better mileage than the Cayenne Coupe running its gasoline engine:

The AMG GLB offers a standard sequential manual gearbox (SMG). With no clutch pedal to worry about and a fully automatic mode, an SMG is much more efficient than a conventional automatic but just as easy to drive. The Cayenne Coupe doesn’t offer an SMG or a conventional manual transmission.

In an emergency stopping situation, many drivers don’t press the brakes with enough force to stop the vehicle in the shortest distance. The AMG GLB has standard Brake Assist to detect emergency braking situations (by how hard and how quickly the brake pedal is pressed) and then automatically apply maximum braking immediately in order to help prevent a collision. The Cayenne Coupe doesn’t offer a brake assist feature.

The AMG GLB’s standard tires provide better handling because they have a lower 50 series profile (height to width ratio) that provides a stiffer sidewall than the Cayenne Coupe’s standard 55 series front tires. The AMG GLB’s optional tires have a lower 35 series profile than the Cayenne Coupe’s optional 40 series front tires.

Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires available on the AMG GLB can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. The Cayenne Coupe doesn’t offer run-flat tires.

The AMG GLB’s 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 Cayenne Coupe doesn’t offer drift compensation steering.

The Mercedes AMG GLB may be more efficient, handle and accelerate better because it weighs about 850 to 1850 pounds less than the Porsche Cayenne Coupe.

The AMG GLB is 10.9 inches shorter than the Cayenne Coupe, making the AMG GLB easier to handle, maneuver and park in tight spaces.

The AMG GLB is 5.6 inches narrower on average than the Cayenne Coupe, making the AMG GLB easier to handle and maneuver in traffic.

The AMG GLB offers optional seating for 7 passengers; the Cayenne Coupe can only carry up to 5.

The AMG GLB has 2.5 inches more front headroom and 1 inch more rear headroom than the Cayenne Coupe.

The AMG GLB’s cargo area provides more volume than the Cayenne Coupe.

The AMG GLB has a standard remote vehicle starting system, so the vehicle can be started from inside the driver's house. This allows the driver to comfortably warm up the engine before going out to the vehicle. The climate system will also automatically heat or cool the interior. The Cayenne Coupe doesn’t offer a remote starting system.

The AMG GLB’s power window, power lock, power mirror and cruise control switches are lit from behind, making them plainly visible and easier to operate at night. The Cayenne Coupe’s cruise control switches are unlit, making them difficult to find at night and operate safely.

To improve rear visibility by keeping the rear window clear, the AMG GLB has a standard rear wiper. The Cayenne Coupe doesn’t offer a rear wiper.

The AMG GLB has a 115-volt a/c outlet on the center console, allowing you to recharge a laptop or run small household appliances without special adapters that can break or get misplaced. The Cayenne Coupe doesn’t offer a house-current electrical outlet.

Insurance will cost less for the AMG GLB owner. The Complete Car Cost Guide estimates that insurance for the AMG GLB will cost $5440 to $12555 less than the Cayenne Coupe over a five-year period.