What do you mean by AA "method"?
As in, the AA settings?
I personally use FXAA. MSAA is more demanding for your system, but all games these days just look so good already with FXAA that I don't bother using MSAA. I can see the difference if I really focus on trying to see the difference, but while gaming I don't really mind the very minuscule imperfection. In Tomb Raider I use FXAA, in Battlefield 3 I'm using 4xMSAA. I think the TressFX hair option in Tomb Raider is rather demanding, which is why I can't touch 60fps in Tomb Raider unless I overclock.