Your should certain buy ORAS over Mewtwo (I suggest you join Team Ruby, we have Sweater Nerds, just saying...) Mewtwo, while great and all, isn't as great as owning a new Pokémon game. ORAS is a wonderful game and I've really enjoyed playing it. Mewtwo has been a little lackluster so far, and although he's fun to use, choosing to get him over a full Pokémon game sounds a little silly.