Its where the band/clamp for the seat tube attatches - some frames may not have clearence for one type. There is a slight different in the spriong mechanism too, which some say makes conventional perfrom better.
and like wise stick with what is currently fitted as a change may not work. But common feeling is that the lower the band the better as it seems to make a stiffer mech.
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Parktools :?:SheldonBrown