I've used all 3. The only search engine I've ever seen that came close to Google in terms of finding what I was looking for was Yahoo. And that was during a time when my computer had a bug which didn't let me use Google.
Okay, I have to strongly disagree here. I actually did that "bing challenge" and 5/5 of what I thought was better was google. Google just tends to come up with more relevant and more useful results for a search.