If you are concerned about privacy of chromium-based browsers, I don't think anything would beat just straight chromium.

However, on my machines I just main firefox with edge as a backup. Mainly because edge is already pre-installed on my Windows machines so there isn't really much point downloading and installing an alternative which does the exact same thing. Especially if it's only for use on chromium specific websites.

It's not like you can remove edge from Windows 10. Why would I install Vivaldi, Google Chrome or Brave?