Bing. Oh, please.
"Hey, that's a cool web site you found! Where did you find it?" How many people of any age will want to say "I used Bing"? I would bet that most people who used the Microsoft product will instead say "I used Google" because it sounds much less lame.
Similarly, which sounds much more stupid: "I Googled it" or "I Binged it"?
Microsoft has a terrible track record with names. Oddly, the least horribly named product of the last decade, Vista, is one of their worst from a user experience standpoint. ("Excel" isn't a bad name, but that was an entire human generation ago. And it came at the same time as "Word", which was competing with "WordStar" and "WordPerfect". Yeesh.)