no question...if you are deciding between c63 or m3 then you play in a game that most of us can only hate on...
However - the c63 front end looks jacked up but the interior is AWESOME when compared to the m3. if i had to put my $$ down, i agree with an earlier post and grab a GTR and smoke both these cars.
2013 E93 M3 6MT
2011 Jetta TDi 6MT | Malone Tune | RawTek DP and Straight Pipe Exhaust (DON'T SLEEP ON THE DIESEL)
2007 Tacoma 4x4 6MT | Dog Hauler