I havent been on any of them, but I think S;UF looks so much better. But Air has a very unique way of switching from flying to lay-down position which Ive heard is great [8D]
Well, I guess they give totally different rides... S:UF is probably more intense (tho I wouldn't know, I haven't ridden it yet) And Air is all about just making you feel like you are flying and is not meant to be intense at all. It would be pretty hard to choose which is better.