I rotate on each playthrough; usually by the time I've left Midgar for the first time I've decided who's gonna be used. Having used Vincent and Cait Sith the least in the past, I'm gonna use them on my next playthrough... I consider their Limit Breaks to be pretty high-risk, especially since I currently have no memory card and am gonna therefore attempt a no-save, whole game in a day challenge in the near future, so it should be interesting, and serve as an adequate test of just how good I really am at this game