afaik (and *please* correct me if im wrong because id love to know how to do this) logic records/bounces to .wav as it plays in real time....so when you want to record your track to .wav it plays it through and records as it goes. if your track gets really cpu heavy (which it always seems to when producing electronic music) and it starts stuttering or getting asio overloads your bounce will either have glitches in it or will be canceled.
in cubase it does it silently with a progress bar (in the way that reason does) and takes as long as it needs to produce a shiny unblemished rendered wav
have a nice day
-Dan