If your form is clean it doesn't matter what you throw, as long as you can get it up to its cruising speed. I seem to be able to put a lot of speed on my forehand throws, but I have big OAT problems that I can't seem to fix. I think it's my grip, but I might be wrong. As it is, I generally only use overstable discs for my forehand drives, and am learning to account for the OAT when I need to "shape" a line. There's a guy I see at weekly doubles a lot who can throw the fool out of a disc forehanded, with a fairly clean release, and he's an unconscious natural -- he doesn't know what he does that works so well for him. He could probably throw anything he wants to, but would have to be choosy with his backhand, which is surprisingly weak relative to his forehand.