Sorry for this thread, I had been reading about turbos for far too long and just was not seeing what was right in front of me!!!
I took another look and noticed ball bearing only on the much more expensive unit and that would do it.
I was lucky a few years back to have a 6262 JB and a 6262 BB on the same 10.70 car, The BB did spool a tad faster but not a $800 justification. On the way to the track the BB unit failed because a piece of silicone(not aware it was used on the fitting prior to install) made its way into the oil feed and plugged the pinhole used to feed the cartridge. Bent the shaft and locked the unit up.
Well before stupid things like Alky Control and E85 most turbos lived in the 15-18psi range. Which explains why I see so many Te44, 45, 45a, 60-1, 70, and Ta49's still hanging in there. Now with 24-28 being the "norm" those unit are starting to fail and the new units get introduced to a life of higher psi from the start.