Brave is one of fast. privacy friendly and less Ram Usage Browser right now. Using it since launched. but Brave TOR is not as privacy friendly as TOR Onion Browser. Browser Fingerprinting is still big issue for Brave Browser.

For example if you login to your google account in regular tab. and use different google service in private tab and TOR tab. Google may able to link all other tab content to regular tab account. because it may not share Cookies but Google uses different tracking methods. so your Brave TOR Tab activity may track back your real identity. not happened with real Onion Tor Browser.