keystone, because i never see the other two (never actually had milwaukee that i remeber and natty ice was ruined by Bro Rape). no one buys them. its ALL keystone here. Pabst occasionally, which i prefer, and high life, which i also prefer for cheap.
bud light, bud, occasionally the labbatts, occasionally red stripe and corona are what are seen most around here at parties(besides keystone).
my favorite beer is probably kalik, which is what they have in the bahamas (you have to try it) or like a cold corona in the summer. guiness can be nice, but its usually too thick to pound so its a good "after drunk" beer