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I take it you are refering to Watch Dogs.
Are you using Nvidia? If so you can use the settings at the bottom of this page.
.. I have amd cards atm , heard watchdogs isn't that great on amd though 
It is not rocket science, you can just try it yourself and choose the one that has good enough FPS and looks the best for you. It might even change with different games. I am very annoyed by the sharp edges of a picture without AA so would opt for some AA even if I will have to lower the other settings. Usually shadows and effects are quite demanding, so lower them first. Textures and AA are left for the last.
.. I opt for textures over AA .. Especially in competitive mp , was just wondering what other people do 
A few quick Heaven Valley benches. GPU was not at full load in parts on 1080p 0AA so can only presume this was CPU limited
1080p 0AA 4320/103FPS
1080p 4AA 3949/94FPS
1440p 0AA 3485/83FPS
1440p 4AA 2752/66FPS
i5 760@4ghz/8GB/2xGTX670
thanks for doing that for us