Interesting research from Jonathan Sampson, where he watches the network requests a browser makes the very first time you launch it on a fresh install, and otherwise do nothing. This gives you a little insight into what kind of information that browser wants to collect and disseminate.
This was all shared as tweets, but I’m linking to an unrolled thread if there’s one available:
Looks like Brave is the cleanest and the most questionable is… Opera?
For full disclosure, all threads are by Brave employee.