Hi Stephen, my suggestion is to test drive a V35 1st. I hope you won't be disappointed after that.
But if I have to choose from what I know of them.
Pros.
V35 - Sleeker design, Choice of coupe or sedan.
M35 - More practical, Turbo, Non boy-racer image.
Cons.
V35 - Not much practical (After modified), Non-turbo.
M35 - Heavier.
Good luck, Stephen.