[MrEngenic]

With many limpers it is better to limp with AJ and AT if they are not suited and you have the button. Well, it depends on what limping standards they have, if they come in with anything I guess it's ok to raise. By keeping the pot down you can protect it on the flop better, and if you miss completely it doesn't cost you as much.
If you don't have the button it is better to raise if you can raise out the players behind you and gain the button.