It should be noted that privacytests.org is ran by a Brave employee (IMO there should be better transparency and disclosure on the home page).

As someone in the field (developing Orion browser) I can say that the tests do appear to be biased towards Brave features and do not include testing the most important browser privacy feature of them all, which is telemetry (Brave and most other browsers include a ton of telemetry by default).

That is a shame because the idea of the site and its open source nature is good. We definetely need something like this, just operated by an independant entity to prevent any conflict of interest for something as important as the topic of privacy.