Pocket aces are worth a lot before the flop, while pocket 2's are only worth something if you flop a drilling with them. But drilling 2's is a respectable hand with which you definitely want to get all in. Even if there is a flush chance on the flop, drilling 2's are still a good hand because you could still get the full house. That means you should just call with pocket 2's and see if you hit the drilling. If not, your hand is worthless after the flop and you can fold. If no one has raised preflop and you are in late position, you can also raise with pocket 2's to steal the blinds or win the pot with a c-bet even though you haven't hit a drilling. With aces you have to raise preflop from every position. It's best if you get all in before the flop. Against every other pair you are 80:20 ahead. If the flop is very draw-heavy, e.g. JT8s then you want to win the pot immediately after the flop. You have to raise to protect your hand. Aces are strong, but not invulnerable. They can be overtaken. When that happens, you often lie down almost hopelessly behind, e.g. when someone gets a flush.
Oh this is a question for me, every time I get 2s, I go all-in and always win. regardless of what my opponents have. One time i was up against AA, and won. But every time I try to do something with pair of aces, I lose. Strange things..
A very interesting question. Oddly enough, I'll go with AA, because it's my favorite starting card. In general, with 22 I enter the game if in the blinds, or when there are only 2 people left in the game.
I like the question... Now that I think about it. I'd say pocket 2's because I win more with them and I loose more with bullets probably because I over play them, they are harder to fold and I'm less cautious about them.