I own both cars (and both are loaded feature-wise). I could care less what other people think. My 135i is more fun to drive and my 335i is more comfortable. Both are great cars. If I could only keep one car, I'd rather have the 135i, but that's just me.
(1:40 @ Laguna Seca, 2:03 @ Thunderhill, 1:56 @ Infineon)