When I researched these many people that used them didn't seem to think one was better than the other. But Isky Vs. Crane. Many just favor the way the Isky looks "beefier" or has a hardened tip.

I have been told by builders you need to run hardened shafts or else they will gall to the rockers. Some people with mild hydraulic cams have gotten away with stock shafts but it's not recommended.

Here is a thread with with pictures of the original Isky rockers: https://board.moparts.org/ubbthreads/show...amp;Search=true

The newer isky's are just relabeled cranes. Like these: http://autoplicity.com/products/1285055-...CFaw-Mgodml4AqQ

Nothing wrong with either. Many people say they are all bullet proof and very reliable in the right application.