I owned C63 and now m3. IMHO sotck to stock or modded to modded, c63 is the king of drag. A NA c63 with tune and exhaust can push out over 500 rwhp, theres no way m3 can beat this. Interior and exteior is subjective so dont talk about this. Handling a lot of BMW guys say it drives like boat. Ive driven plenty of mercedes and trust me, C63 is totally out of what i expected, it handles way better then what i expected.
2011 E93 DCT