Originally Posted by izzyracer

Zac, they are both a user preference thing. But generally speaking, base on feedback from other racers and my own experience. A one way set-up is harder to drive overall mainly because you are driving without brakes since your car will spin out when brakes are applied. Spool is very close to running ball diff but will handle more aggressively but in return can put more stress on your drivetrain. Even most pro drivers stay away from one way because of its nature but again if you are good with throttle control and hardly uses brakes, one way might work for you. If you are just starting out, I would suggest to stick with ball diff setup then maybe jump to spool when you believe it can be an advantage at a certain point.

As far as compatibility...yes they will all work. except V2 uses a larger pulley. TA05 original has smaller pulley.