Fastbacks have been around since the 1930s when automotive designers started using airplane shapes to smooth out square angles and rough edges on boxy vehicles. Some of the resulting designs are iconic, breathtaking, and fast. Other end up looking like something that you popped out of a Silly Putty egg—bulbous, awkward, and unwieldy.
All in all, the 2016 GLE Coupe is an interesting piece of SUV/car chimera, and despite niggling complaints, it’s enjoyable to drive and comfortable to ride in. If this style appeals to you, I’d go with the GLE 450 AMG. Sure you get additional horsepower and torque with the 63 and the 63 S but the 450 offers plenty of enjoyment and horsepower for what most people will be putting the car through.