I had the same choice to make, I just cant get into the larger feel on the m3 or the 335i
I went 135i simply because it felt better driving it
I do not like the exterior on any of them
You only need two tools in life - WD-40 and Duct Tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
Gone but not forgotten..
1974 2002, 1987 325ic, 1987 325is
1995 M3, 2001 X5, 2007 MCS R56