This forum have lost some of the magic. Back in the days this poll would have exist the moment C63 been released.
Agreed, a lot of magic and plain fun is all but gone.
Anyway I`m going to go for the M3 this time. There are some thing that I do not like about it though...
The front spoiler is butt overdone, (the upper fins remind me of turned out lips.) the rear area around the taillights is rather dull looking. Other than that it has a level of external excitement the C63 is sadly lacking in. Mercedes-AMG seems to have a pattern going on with it`s AMG line. Thay seem kind of dull on debut. Come face/lift time is when the corks pop off the wine bottles. Much more aggressive packages with power boosts exc, exc. Looks like we will have to wait for that time. Interiors for both cars are ok. Again, I think I will go for the M3 here. The C63 is a touch more upscale with its aluminum switch-gear and some "hand of craft" shapes to the design. The overall impression is not that great imo. The M3 will age a little faster... industrial shapes from numerous past BMWs, plastic ac vents and button-happy switch-gear ( A constant rehashing and milking.) BMW seriously needs to break that method and come up with something unique. The interior of the M3 is pretty decent for a modern sports sedan though and is why it gets my vote.
The M3 should do better on paper to... lighter weight, faster tranny, exc. M3 please.