I have always found the M3 to be more comfortable than the M4. My laptimes in the 2 vehicles were better in the M3;
I've always attributed it to my own personal comfort with the sedan's platform, went from 2 e90s, to the F30, to the F80.
So at the end of the day, it will likely just be a matter of which vehicle you're more comfortable - from all perspectives (# of doors, convenience, etc)
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