bushing or bearing?

I'd rather have an bronze bushing than hard steel rollers on my input shaft. Roller bearings can do alot of damage to the input shaft if they run dry or get dirt in them. Also if the rollers chewed up the input shaft you would have to replace it, if the stock style bushing wore into the input shaft you could then use the magnum style pilot bearing which would ride on the undamaged part of the input shaft saving you from replacing the input shaft.
The most important thing is not to ride the clutch, this will increase pilot bushing life on either style bearing/bushing