I want to offer Vivaldi some praise, I switched to it as my main browser a few years ago, and it's been great. I had to look for a new browser when Firefox (that I had used since the Firebird days) kept breaking my settings and plugins with their updates. After yet another Firefox update I wasn't able to restore the browser to how I want it to be, so I tried Vivaldi.
I'm not even a big fan of the original Opera, but love Vivaldi's features such as easy screen splitting between two tabs and one-click actions to disable images or apply certain filters to a page. Picture-in-picture and pop-outs for media are also great, periodic tab reload is occasionally very useful.
Ideally I'd like to use a fully FOSS browser, but my patience with Firefox ran out, and Vivaldi is Chromium + custom open-source parts + closed-source UI layer. Good enough for me, though not ideal.