I personally like google better because whenever I type in something on bing it NEVER gives me what I'm looking for. Google does. On bing though I do like the pictures that they have on there.
Duckduckgo. As noted, google's learning algorithms place it above competition, however it's quite underhanded in its other uses. I defer to google only for natural language question matches, and even then it's in one of quora / ya / reddit / stackexchange / niche site (meaning, posting the question in a forum would've worked as well, were one more willing to register), or nowhere.