[onefastdoc]

Well, I had both cars. A modded 335i (Procede, etc., 370whp) and an E90 M3 (with intake and pulley) and I would say hands down the M3 any day. As just a daily driver either car would be fine. The 335i was actually better around town as it had sooo much more torque than the M3. However, if you like to drive your car hard, do track days at all (I often went to Willow Springs), then you absolutely want the M3. The 335i was not so fun at the track. No limited slip diff, brakes too small, suspension too soft, engine would overheat all the time. The M3 was a track monster. I could run all day long there. Handling was just perfect. I think my 4 door M3 was the best all around daily driver / practical car / track car I've ever had. That being said, I did get rid of it and replaced it with a 2012 Nissan GT-R. Holy crap. With a few mods and 600hp, it's really mind boggling how fast it is!

Back to the original question. I say M3.