Queens are a very slight favourite. I would say a bigger favourite if there is a raise and call in front of you because quite likely there are two aces out, but the rule of thumb is if you have the queens, the ace will flop or even worse river, while if you have AK there will be 5 rag board or some such.I prefer QQ if i am to go all in preflop
I prefer AK to play through the streets