Looks department, the MB wins in the rear while the M3 wins in the front. In terms of what car I would rather have, M3 by far. It's winning tests like the E46 did. The M3 sedan, coupled with the dual clutch transmission would make this an ideal family car for me. That's why I've always argued for cars that allow you to set everything to your liking.
And for your viewing pleasure (from another test though):
P.S. I wouldn't pick the CF leather trim with black leather. It's just too dark. This is much more like it:
