OK, please don't let my situation skew anything ... I really just want to know, for fitness reasons which ins the better bike?
I'm presuming the geared bike simply for the reasons that it's a superset on the single speed (IE: it's several single speed bikes in one) and thus you can manage a desired cadence better.
I had a geared bike in high school / college but alas it was stolen in college. Trek 720. It was a nice bike but I only really commuted on it never tried to work out. Unfortunately given my present situation I'll have to stick with one bike so I'm trying to figure out whether to go with a fixie/ss (flip flop hub) or a geared bike.
thanks,
philski