Safari mostly. I prefer the incredibly minimal UI and iCloud integration. With some Userscripts and an adblocker like Wipr it’s smooth sailing.

As a backup I use Firefox modified to look like Safari: Safari Firefox Mod - https://github.com/AdamXweb/WhiteSurFirefoxThemeMacOS

Try Searx. It is a free, open source metasearch engine so it gets results from other engines. Albeit much more privately than accessing those services directly.

Searx wiki