I bounce from default engine to engine (most recently startpage as a 'better' google) but so far always find myself back with google search. Last time I went elsewhere, I recorded the occasions when I appended the URL bar search with @google. Quick info on a business (address, telephone # etc.) and maps dominated. I haven't used another engine that can deliver similar. I also realized how much time I spend looking at maps and street viewer...

The knowledge graph and maps are a massive search moat.