That search engine is the one that matches the way you think, and generally gives you better results than any of the others do.
Search engines have personalities.
HotBot is a control freak. I can say I want it in the title of the document or that I want to do a boolean search. HotBot usually gives me what I'm looking for because it matches the way my mind works, and I know how to play it like a violin. But my colleagues aren't anywhere near as fond of it. They like other engines better.