In a cash game, I play AA agressively 95% of the time. If I'm the first one to enter the pot, I raise, if there was a raise before me, then I 3-bet, and if there were multiple actions I will most probably shove with aces, especially when there is more than 15bb already in the pot. taking down dead money with a chance to stack a loose opponent that decides to call me off, is always good.
Slow playing with AA is just a waste of value in my opinion, I can only slow play them from early position, and only when the dynamics at the table is quite aggro at the moment.
In tournament however, slowplaying AA is more common, especially in SB to BB spots or when I want to provide a good opportunity for my opponent to squeeze, I will call a raise from LP sometimes to induce an aggressive player in the BB to try and resteal the pot.
But in general, since AA is the strongest hand in NL Holdem preflop, it is natural that you want to invest more money with this hand at this stage. Because on different boards, the
equity of AA can change drastically.