Its a tough one, as this is not a like-for-like comparison.
If there were more parameters included in the comparison then the results of the poll would be more "fit-for-purpose"
i.e (a) "e46M3 or Z4M coupe for an eternal bachelor"
(b) "e46M3 or Z4M coupe for daily knock-about"
You cant go wrong with either, so flip a coin :thumbs: