Neither... play it like every other hand.
Best answer I've read so far is this ^ one.
Play it like any other hand you'd play.... adapt to the situation in front of you (play it based on a number of factors that make up your current situation). Poker is situation dependent. Newer players try hard to make things black & white when this is often not the case with poker.
My other obvious observation from this thread, many in here seem to not have experience playing post flop poker (or they're afraid of it?). Easy answer > "Learn how to Play"
Ways you might want to go about that could include playing 100bb deep cash table poker. Even if you're hoping to get better at MTT's, try putting in 50,000 hands of NLHE cash tables, 100bb's deep, even if needing to start off at the lowest of limits available (ie. "2nl" $0.01/$0.02 blinds). I assure you that your Tournament game will improve considerably.
If the OP's question is pertaining to "How to play AA in a freeroll?" (which I'm guessing it does), then this too is dependent upon the situation... BUT simple answer is > IF you have a great chance of other players willing to call off open shoves WIDE... then by all means put all your chips in preflop & don't even bother with a 3x bb raise... or a 3-bet over another raiser's open. Just shove it in. Simple.