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Trouble with the needle bearing whether on the tip or the felcrum is that the load is only on one side and they rock back and forth.

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Oh, and a bushing is different because it rotates ?!?!? NOT !!!

Bushings or bearings on the fulcrum could be debated for years with no solid evidence that one is better than the other on a rocker of equal quality. However, a roller tip will absolutely have less friction and wear that a non-roller tip. In this case, Isky got it right with hardened inserts but I have seen many Cranes where the valve stem has worn a groove into the tip.

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did not mean to infer that but the needle wear leads to failure sooner than a bushing would fail. Ever chased a bunch of little needles around through an engine and seen the damage that they can do????