You can use whatever you want, tbh, you’ll just be judged. What browser is best really depends on what’s important for you.

In terms of features and functionality, Vivaldi is on a league of it’s own. No other mainstream browser can compete. Edge from Microsoft takes the second place (no, really). Everything else is far behind on third place. (I don’t know about opera though, haven’t seen it in a decade)

In terms of privacy, the picture is very different. Also depends on what you consider to be an invasion of privacy (is phoning-home bad? Is telemetry bad? Is allowing cookies bad?) some browsers do one, others do others. If everything is bad, then Firefox is the king here.

If you don’t care about any of that and wants something that just works, maybe safari I guess?

Any recommendation you get here will usually take in account what the recommenders’ think is important but your opinion might be different.

Ps: Chromium bases browsers don’t necessarily pack in everything that Google does. Most of them are actually forks that still get to have a say in what they do or don’t.