Indeed, the B6 Gran Coupe will be so rare that you’re more likely to spot a Porsche 918 Spyder or even a Ferrari LaFerrari. (A tiny, family-owned company of 210 employ Alpina builds a total of 1500 3-, 4-, 5-, 6-, and 7-series–based cars per year.) Of course, scarcity isn’t the only thing that matters, or Chrysler’s TC by Maserati would be considered a success. Logic says you should get the M6. It’s more powerful, it’s an M car, and everyone looking to impress will be awed by its prominent and numerous badges. But we think you should strongly consider the Alpina, which is more compelling because itsmix of luxury and performance favors the former. Unless you’re taking your M6 to a racetrack, it's likely you’ll enjoy the Alpina more. The only exceptionis if you want a manual transmission: In keeping with Alpina’s luxe-oriented, ease-of-use philosophy, the sole transmission here is an eight-speed automatic