Firefox.
I quite like Epiphany/Gnome Web, it has some nice features like saving a web page as a 'desktop application' (of course, native applications are far superior, but not always available) but it seems to struggle with some websites so I can't really use it for the bulk of my browsing. I'm not really a fan of GTK HeaderBars either.
So mostly Firefox but with some Epiphany 'desktop applications' 😁