full scene antialiasing method, what is best??

I was fooling around with my opengl settings and came across this setting (full scene antialiasing method) ant then three choices besides “no antialiasing” there is “2x2” "2x2 LOD bias) and “1.5x1.5” which is the one that gives the best quality??

ps. I have a (geforce 2 gts ddr 64 meg)

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