Which is better - Emacs or Vim? (Google fight)
Ruby, 203 180 bytes

-&gt;*s{s.map{|x|[(open("http://www.google.com/search?nord=1&amp;q=#{URI.escape x}&amp;nfpr=1").read.match(/s"&gt;(About )?([\d,]+) result/)||[?0])[-1].split(?,).join.to_i,x]}.max[1]}


+11 bytes for the -ropen-uri flag (plus space).

Input is taken as two arguments.

URL explanation:


?nord=1: prevent auto-redirect from HTTP to HTTPS
&amp;q=#{URI.escape x}: escape the query so "s work
&amp;nfpr=1: no autocorrect


The whole map turns ['emacs','vim'] into [[2150000, 'emacs'], [14900000, 'vim']]. (You can see this by changing the .max[1] at the end to .inspect.) Then, the max is taken, which will grab the one with the most results, and [1] is used to get the search term.