I’ve gone between a few but on desktop it’s Librewolf. Just like Firefox but more privacy by default. On Android I’ve tried Fennec, Brave, Iceraven, and Mull. Out of all of them Iceraven has been my favorite simply because of its support for desktop extensions.
qutebrowserby far. I love being able to use keyboard only and I find its ability to find all the links in a webpage superior to extension based keybard-driven browsers.