Vivaldi is about as good as you can get with a Chromium based browser, but with the fundamental compromises that come with Chromium thanks to Google's influence. It is European based so may have better governance and fundamental provacy than US based companies, but that is an assumption.

At the end of the day Vivaldi is a commercial browser, and that is a fundamental compromise that means it has to weigh up it's commercial interests against users interests.

That said, I use Firefox as my main browser, Librefox for some other stuff, and occasionally use Vivaldi with a VPN extension for some stuff, and rarely Chromium without extensions if I have something low level to do on a site that I can't be bothered messing around with fixing adblockers on. I don't think you have to be all or nothing; it really depends on what you're trying to do and when.

Vivaldi itself is well designed; it's designed more for power users and tries to do everything. I just use it for browsing, but I appreciate the touches it offers. If you want to use a Chromium based browser, it's a well made one.