This is a tough one. I find both of these hands to be problematic. I don't like playing weak aces. With A-2 off in particular, you're either looking to hit an Ace or precisely a 3, 4, and 5. Of course you're going to be ahead pre-flop and your hand only needs to hold up. But how confident are you going to be with just Ace high and a weak kicker if you don't connect. If you do hit your Ace, it's going to be hard to be hard to be confident that your opponent doesn't also have an Ace and have you outkicked. If you hit your deuce, then you're holding bottom pair and every card that comes out and doesn't connect with your hand is going to be an over card to your pair, potentially making your opponent a bigger pair.
In my mind, 8-10 suited, being situated closer to the middle of the deck, seems more likely to connect, as well as create straight and flush draw opportunities. But 8-10 suited, with it's potential for creating so many drawing opportunities, is often going to create enough equity to keep you in the hand and chasing draws, that if you're me, very seldom seem to get there. But if I had to make a choice, I think that I would choose the 8-10 suited.