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I'd take the M3. It looks better, I like the interior better (simplicity is a + for me), its just a hair slower in a straight line but works the c63 around a road course.
I just read the comparo in a major car mag......they picked the M3. Basically the slower M3 considerably outpaced the benz in a road course. I actually like the benz styling much better. The M3 hasn't impressed me..........yet.
The M3 is more of a sports car, the Benz is a really fast luxury car. It all depends what you want. With that said I hope to trade my CLK500 on a new M3 in a year or so.