Rutra is generally correct in what he says there. You may find yourself experimenting with several setups before you find what you need.
Regarding my AA setup, I did state in my previous post that you wouldn't need my settings there. The settings you see there were from my last work, I only brought my previous user settings up to show an example of what the settings parameters looked like.  My last piece did more or less need those high settings (I probably didn't need texture AA so high) because I was using very high quality volumetric lights & hair. Yes, I know I could probably have gotten away with less but long render times are generally not an issue with me. I will wait for that extra touch in render quality.
I'm not going to argue with anyone who chooses their own AA settings, but I will say I have seen  renders from a personal perspective that I know the AA wasn't high enough. People will find what they are happy with.