Practice is the most important item. I would say prop is the next important thing because the prop to fly fast is not the prop to hang and last I would say control throws and how large the surface is. When the plane is flying slow the throws will be triple of normal for them to get the leverage; that is why 3D pilots use lots of expo and the duel rate switches to stitch between the sensitivities. The best hover guy I have ever seen learned on a big stick and it was much more fun to watch him do it with that plane than his profiles and gassers.