gonzalo agree Brave is very weird. I also heard they are sometimes behind on Security Fixes and include 32bit code. But absolutely no sources on that, would be highly interested.
Have a look at my FR here in their very inactive Forum. They use their own version of Chromium, while being a pure Webview Wrapper would increase security a lot on GrapheneOS afaik.
Brave is very bloated with things you dont need. I guess one shouldnt use a Crypto Wallet in the Browser for security reasons. Their BAT system seems to suck, I would like a way to pay websites I use a small amount, not watch Ads. They may have more bloat here and there, like the "privacy conscious translations" which are not local like on Firefox, their "privacy conscious LLM chatbot", their horrendous new tab page bloat etc.
They are focused on very weird things, but have a headstart on many others like
- accountless sync
- adblock builtin
- brave shields
On Desktop there is no Vanadium, just Ungoogled Chromium which Google blocked from Addons and Sync on purpose. Its not a usable Browser imho. Brave is, after disabling many things.