Interesting. Please let me know if you have a better alternative. Ideally I'd like to just run chromium but then I have to build it myself or use some build by some untrusted person so I've decided I'll trust Brave for now...
Aside from Tor Browser, Firefox with arkenfox/user.js is ideal for privacy [1].
Chromium-based browsers like Brave are ideal for security [2].
An ideal solution for privacy and security would be running Firefox+user.js in Qubes OS [3], or for even more anonymity, Tor Browser in Qubes-Whonix [4]. However, even this isn't bulletproof, and a 3 letter agency can still determine who you are with techniques like keystroke deanonymization [5] or other techniques [6] like traffic analysis. Tor is also not reliable for anonymity because the project is kind of a shitshow [7], so there's really nothing you can do to truly hide.