I've owned both AO and RE frames, and although there are many similarities, it is incorrect to say that they are precisely the same frames. This is my opinion, but here are my thoughts:
-IMO, RE has better build quality, finishing, and presentation (better case, etc)
-RE is the company that actually has the military contract (in other words, these are what pilots and astronauts actually wear)
-RE has better customer support, and more...