Stage 2 hotcams are normally more for the everyday rider looking for a little more umph. The stage three is more mainly for racers who are in the top of the RPMs 90% of the time. Both are reliable, but for the Stage 3, you normally go with the bigger hitting piston (higher compression). It all depends what you want. I'd go with the 11.1 and stage two, so you can run 93 octane.