A list of worthy competitors, the winner of which is determined by number of Google page results:

low carb vs. low fat (Winner: Low Fat!)

Kottke vs. Slashdot (Winner: Slashdot!)

Fark vs. Metafilter (Winner: Fark!)

ass vs. titties (Winner: ass!)

Einstein vs. Galileo (Winner: Einstein!)

Paris Hilton vs. literacy (Winner: literacy!)

yin vs. yang (Winner: yang!)

Krystal vs. White Castle (Winner: White Castle!)

circumcised vs. uncircumcised (Winner: circumcised!)

Ja Rule vs. 50 Cent (Winner: 50 Cent!)

Agent Cooper vs. Black Lodge (Winner: Black Lodge!)

Florida vs. Frances (Winner: Florida!)

Bush vs. Kerry (Winner: Bush. God fucking help us.)