Ace and Thunder are the best at what they are trying to do IMO. Indy are a nice compromise and if there's ever a Stage 12 I'll likely try it but if I want to turn quick and deep in the bowl, nothing beats Ace and if I want a stable yet snappy response on street, Thunders are great.
If Ace ever make a truck between 44s and 55s, that might be the truck I skate to my grave.
My madness is really this. ACE on one end and Thunder on the other and I agree, Indy (and subsequently, Theeve) are right there in the middle if you want something that does it all 'good enough' without going crazy on pinch/pop/baseplate slide/grindage. It comes down to feel too and not just turning.
I've been riding forged hollow 144s for the past three weeks (new Ace regs bottoms/Ace low tops bushings /riptides) and have somehow not thought about swapping them out after I switched over from theeve (just couldn't get theeves loose enough without using bones softs and entering wheelbite hell).
If indy ever drops that low we've been hearing about (and if it's snappier), or thunder releases that extended baseplate things will get heated again!
For now I'm in the indy/bones ezstreets combo.
But seriously, the ACE bushings really do get indys singing (due to the break in, I am sure you could get the same feeling out of indy aftermarkets if you followed through the break in).