Also back on Indy (149 cast hollows w/94 barrels from 44 classics stock), just giving my two cents:
For me, the pop and pinch on Indy are significantly better, and as others have said the grind is faster (which I will take over smoother). I don't think the turn is crazy different, though due to the shorter top bushings the rebound isn't as nice on the Indys, and they bite a bit more easily due to the axle placement.
The improved (for me) pop and pinch, along with the durability, were the clinchers. The classics are good trucks, but I objectively skate better on Indys and they last me significantly longer.