Ah browsers! I customize mine to the point where when I have to switch it's a huge pain in the ass!
Good old Firefox, which lost a lot of its useful extensions when transitioning to a new and admittedly rather effective engine. Finding approximate extensions was a pain, but I've got most of its important functionality back.
Chrome Canary (which basically means "eXtreme Beta") to check out what's going on with the browser engine development that all smaller players depend on these days.
Opera for a Chromium with a highly curated extension library that I can reliably expect not to have any malicious add-ons or 12 mediocre variations of one functionality I need.
Vivaldi or BATBrave are not browsers I've spent a lot of time with just yet (although I should have!), but then Brave went through a complete overhaul recently and seems to be mostly another Chromium now with a special variety of ad block, though admittedly a very unique and interesting one.
As for Edge... I think in my attempts to secure it or hobble its potential as an attack vector on a Windows machine I've broken something somewhere and the poor thing hangs on startup. I won't cry for it though, even if it is a decent browser by today's standards.
I tend to separate my browser installations by major activity -- for example Opera is my browser for all things STEEM and some related crypto stuff.
I feel you. Only thing I do nowadays are the bookmarks and an ad blocker. Nothing else so if and when things go sour, I don't have to bang my head to the keyboard.
I do that too. One for fun, one for work, one for spammy pages, one for something else. And if I need to, every browser for testing sites. But you clearly know your browsers so I'll ask your opinion if I decide to abandon Vivaldi some day.