Consider the fact that you have seen neither cars in real life, the M4 might look better than the M3 in real life with the right options/colors.
No way i'm getting the M3 at this point in life, M4 all the way!!!! (so tired of waiting btw
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The M4 might be .05 mpg more fuel efficient because of the weight saving as well (at this point I'm just throwing shit out there lol)