I'm a big fan of the full legged, sleeveless QR ultrajohn. Unless your Quickjohn is a can't pass up price, I'd say spend the extra bucks and get more leg coverage. It makes getting into the water for pre race warmups easier and for standing around awaiting the start. Also I think there's energy savings in having extra leg flotation, making it easier to stay in a nice hydrodynamic line. Sleeveless works fine if water temps are generally above 60-62 degrees. Any colder and that's a tough swim. If money's no object, more coverage is faster. There's a reason pros race the full suits, but I can't pony up the $450. Finally, don't forget the body glide unless you want to entertain the crowd with a comical longjohn dance in T1.