Imho, I would go with the m60's or m80's depending on your room size, I've never heard the 633's but I own the aperion 532's, while I have to give the nod to aperions finishes at this point, I much prefer the Axioms. If I had had to do it over I would go with an all Axiom setup. The aperions are good but not great, look at the reviews as well as the aperion boards and I think that will help with your decision.

A computer once beat me at chess, but it was no match for me at kick boxing.