I like searx quite a bit. I would ise it exclusiveley if there was a well functioning instance available. Unfortunately some features (search for files, search social media) didn't work on the instances I've tried, and there seems to be some issue with setting it as your default search engine on android. For me it works fine for a few searches, then at a certain point searchong for anything from the browser bar just redirects you to the sites homepage and you have to start over there. Local results are a bit lacking but this is essentially by design and adding a zip code or whatever usually helps.