The X5M may be equipped with a much more powerful 4.4-liter turbocharged V8 pushing out 555-horses to all four corners of the car, but the fact remains that it's a tall and heavy SUV.
The M3 Coupe, on the other hand, makes up for its less potent 414-horsepower naturally aspirated 4.0L V8 by being significantly lighter and far more nimble on the road.
So if you're on a track, the answer to the question we posed in the title should be obvious. Well, at least it should be if you play a fair game. Watch the video after the break and you'll see what we mean.
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