Personally I hate A/K and would prefer playing a pocket pair, although pre-flop with A/K you can be more aggressive, because if either card should catch the other player expects you to have an Ace in your hand, But with a flop of say 9,7,2, an Opponent would not expect you of having any of the cards and of course would bet his Pocket pair, or check to you depending on his position in the betting.
I have folded both A/K and a small pocket pair like 2/2 or 3/3 in some situations, It all depends on your position in the hand, your Chip stack, and of course the Impression the rest of the table has of you, Aggressive, Passive, Tight or Loose, it all come's down to what the other players believe you have, and what kind of player you are.
Playing 3/3 like you have an A/K or A/Q still gives you the opportunity to bet the flop of an A,7,5, flop if you believe your opponent is holding anything but an Ace, but then you have the added problem of what suit the flop is, drawing to a nut flush with A/K suited is very tempting to most players, I know I would not be going anywhere until the river card is dealt.
It depends on all the above reason's I have already gone through, but I am sure I have played both A/K and 3/3 in similar ways, Raising in some situations, and just calling in other's.
When the fun Stops, STOP!