Polyurethane or Polygraphite?

FWIW, the front end in my 68 Barracuda was relatively new with stock rubber bushings. When I did the 73-76 disk brake swap I rebuilt the doner parts with polygraphite bushings. I saw no appreciable improvement in the handling compared to the rubber bushings and the ride was not appreciable harder either.

But, within a couple of months the strut rod bushings were squeaking like and old clunker, it was embrassing to drive into a cruise with the car. You could lube them and it would stop for awhile but would come right back. I swapped back to rubber bushings.

I would venture a guess that the folks that see a big improvement in the handling with poly bushings are going from a worn out front end to an all new one.

I just don't think the poly are worth it and factor in the fact they will likely wear out faster (they slide on the shells and can't be greased easily vs the torsional action of rubber) I would recomend staying with rubber.