whichever is more aestheticaly pleasing to you. I like the SM because it isn't as "chromed out", per se. I like the blacked out motor and no spokes to clean. I do like the traditional colors of the BA tank though. I guess I can always costomize it one day with a BRG tank and fenders...but I probably won't. Either way, just go with whichever suits you. If my butt weren't so big, I may have considered a T100
