On paper, the BMW M6 and Alpina B6 Gran Coupe appear to be quite similar. Both cars produce in the neighbourhood of 600 horsepower. Both have a top speed of around 320km/hr. And both weigh a hefty 2,000kg. In the real world, however, each car has a very unique personality. With its dual-clutch gearbox and high performance rear-wheel drive chassis, the M6 is the true track star of the duo. The B6 may have slightly better straight line performance thanks to its all-wheel drive setup, but the M6 is one to have if all-out handling poise and driving thrills are the goals. The biggest issue with the M6, however, is that, at the end of the day, it is heavy grand touring style automobile. Many Gran Coupe buyers probably aren’t concerned about track times, and instead just want something comfortable, luxurious, and very fast. In that case, the Alpina B6 fits the bill perfectly. See what Motortrend thinks.