https://privacytests.org rate Brave as the best browser.
You can but:
- There is no clear indication of bias, from PrivacyTests, just accusations.
- If the tools and tests ARE open source (which they are), they can be checked for bias/cheating. Someone could also expand (fork) upon them to give more of a rounded opinion.
A better defense against accusations of bias is a group or persons transparency.
Simply having an open source methodology and code base isn’t transparency either, since it takes a much, much deeper and more developed skill set to audit both software source code and testing methodology than it takes to raise an eyebrow at sus circumstances.