∆∆∆∆. Exactly. The O.P. is not doing the type of racing that needs a tapered roller so either should work fine. However the adjustable tapered bearing as opposed to fixed location ball bearing could cause issues with disc brakes. That's could not will. Just throwing that out there.

Do racecars that heavily sideoad like Nascar, Indy or F1 use single tapered bearings like we are discusing or do they us opposed tapered bearings and floating axles? Just curious.

In theory, there is no difference between theory and practice. In practice, there is.