What makes a good search engine for privacy and usability?

Google obviously is the biggest and most widely used search engine in the world because duh it's Google. But new alternatives are popping up everywhere. Just to list a few we have... Startpage, qwant, duck duck go, brave search and peekier.

I have been using a mix of all of these search engines in order to get a feel for them. I hope you can all help correct me if I am wrong with my observations

All listed search engines …

brave brave search engine google hope list order privacy search search engine search engines startpage usability world