They do a drift comparison to see how easy the cars are to control and conclude the M3 GTS is the easier car to control especially at the limit. However, the power and torque of the C63 make it easier to keep a drift going. The drift competition goes to the C63 AMG.
Now on to the real question, which is the fastest around the track? The M3 GTS turns a 1:22.1 laptime with Jason Plato behind the wheel. For the C63 Black Series Laptime, former F1 Driver Mika Salo is behind the wheel. He is able to get a 1:21.8 beating Jason Plato's laptime with the M3 GTS. This makes it a clean sweep in all the competitions for the C63 Black Series.
Not exactly a very scientific comparison here by Fifth Gear and it is rather disappointing considering their usually high standards. Using different drivers and timing manual with an iphone is rather amateurish. The drag race is not even timed so there are no numbers to go off. A drift competition doesn't really tell us all that much either. So although the C63 wins, the testing certainly was not up to par. Watch comparison below which is split into 5 segments.