You have to determine what is best for you. You can try and slow play the aces in hopes of a bigger payout. Unfortunately this is how you get your aces cracked. You could also play them aggressively, but often you will end up getting paid off very seldom. Its best to mix up your game, but usually you want to play based off the people at your table. If other players have a high VPIP but a lower PFR, you want to add value to the pot with at least a small to medium sized bet. If they have a high PFR, then it would make sense to check it to them in hopes of getting raised. You can either then immediately reraise or hold off until the flop in hopes they c-bet. Usually by the time they cbet you can go ahead and reraise. If there is no cbet, depending on the flop you might want to go ahead and raise. Usually AA will still be the best hand post flop, but chances greatly diminish on the turn and river. You want to make sure there's action before it gets to that point.