https://privacytests.org rate Brave as the best browser.
PrivacyTests actually started prior to him joining Brave. Brave contacted him, and used that resource as a kind of checklist, to try and improve their browser. Despite the guy now working there, it remains an independent project.
The project technically being independent does not mean it isn’t biased towards one browser.
It’s still unfinished, but he’s working on a tool for you to test your own browser. You can do so here:
https://privacytests.org/me.html
It’s the exact same tests he runs, that are open source. Everything can be found, (if you don’t trust the guy) on his GitHub:
https://github.com/privacytests/privacytests.org/tree/master/scripts