bmw has great engineering, never driven a 6mt m series before but the other manual transmission cars i've driven the bmw 6mt is much better than the z's. Also keep in mind the gas will be more expensive on the m3 than the Z, maybe insurance as well, and like ppl have mentioned maintenance is pretty expensive on a bmw even if nothing brakes down, i would go with the z since i love the fact that it is not as common as a bmw and it has good performance
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