Keep in mind, privacytests.org is run by a Brave employee so it’s data should be viewed with some skepticism.
There is no “best” browser. We have an entire topic on privacy browsers that has been going on for years.
There has never been any consensus.
Privacy itself is a complicated topic. You will never have perfect privacy when using a browser so you have to start by deciding what you want privacy from. Then you need to work to figure out how to stop/mitigate those specific threats.