I got tired of constantly tweaking and fiddling with Ungoogled Chromium, which I've been using for years, so I finally switched to @brave. Here, Incognito mode uses Tor, and vertical tabs work perfectly with full hiding. @Vivaldi would otherwise be my top choice, but it has some weird edge-case bugs, like the fact that not all extensions work in incognito mode. There are many good, minimal and private browsers available, but Google Meet or Netflix don't work on them (because of DRM and Widevine...)
The sad truth is that most browsers are bloated crap. As a CSS person, I'm just not interested in the slow progress of Firefox-based browsers, I need latest web standards and something Chrome-based to use the modern web. Project Ladybird sounds interesting. They are writing the entire browser from the ground up, including the engine... pretty crazy stuff. I wish them luck and success.