I think the 135 is the more gorgeous of the two (looks a lot like the M wheel, is it the M wheel?), but the composite 71 is no slacker either. Personally I didn't order the 71 because in the 330Ci you sacrifice the full size spare and 5th rim if you go to the 71 from the non-SP or 68M in the SP.
Cleaning any BMW wheel is no fun, but the 135 with its thin slots looks like the clean (haha) winner for difficulty cleaning.