If you want a BMW tuned to deliver blistering speed, you don't even need to leave the dealership. Everyone knows that if you want a fast BMW, you buy an M. Or do you? The M division is not the only tuning company that builds a badass version of BMW models. Alpina has been around since 1965, and has created some of the coolest BMWs over the past half century. The company even makes its own version of the 6 Series Gran Coupe called the B6. Like the M6, the B6 has 600 horsepower, but it also has way more torque and an extra gear.

The differences don't stop there. Although these two cars seem very similar on paper, MotorTrend proves that they are actually quite different. The M6 is tuned for dynamic handling while the B6 is geared towards comfort. So which is better?

Both cars pack 4.4-liter twin-turbo V8 engines with 600 hp. The M6 has 516 lb-ft of torque and a seven-speed dual-clutch transmission while the B6 has 590 lb-ft of torque and an eight-speed automatic. Both cars start at around $120,000 and look fantastic. Since the M6 is no slouch when it comes to comfort, it is the one we would choose. But if you want something that is supremely comfortable and really fast, the Alpina B6 is certainly worth a look.