Opera has a dedicated gaming browsing, Opera GX, yes.
Vivaldi's schtick is that they have every setting and feature that you want and quite a few that you don't. Tab stacks, pinned tabs, split screen, mouse gestures, notes, a full mail client, an RSS reader, ad blocker, custom themes, all built into the browser. And just a ton of customizability. You can control the position and show/hide every UI element (vertical tabs is amazing if you've never tried it), you can create "command chains" (a set of commands which fire in sequence on a keyboard shortcut), and if that's not enough, you can install CSS and JS mods for arbitrary functionality.
But this is just on desktop, just about none of those features exist on mobile right now.
My big issue with Vivaldi is the very noticeable lag in the UI compared to chrome/edge. every time I've tried over the last 3-5 years I've been disappointed and switched back to chrome, I wish I could switch to FF, but I have a few extensions I can't do without
Recently switched to Vivaldi and the new tab lag is annoying as I cannot Ctrl+t Ctrl+v too quickly, have to wait x00ms. Tried turning off many features on the new tab page but doesn't fix it.
Unfortunately every feature that you want doesn't include trackpad gesture navigation. I just want to be able to navigate back and forward using 2 finger swipes like every other browser allows me to do. It seems like a small thing but it is the muscle memory I have. Not having it eliminates Vivaldi from my consideration. Also not a fan of how quickly it kills my laptop's battery but I might be able to over look that.
This might be an OS difference, but on Mac or Linux I can use a two finger swipe to go back. (I can also press with two fingers and move in order to trigger a mouse gesture, which other browsers do not have.)
According to Vivaldi this feature was added to the development pipeline in May of this year. It doesn't show as implemented. It hasn't worked on Windows or Linux for me as recently as last week.
