I’ve used Vivaldi for a long time before switching to Floorp (based on Firefox) and recently back to Vivaldi.

Pros:
Vivaldi is fast with lots of features.
I like how it works much more than other browsers (e. g. Sidebar tabs, pinned tabs can’t be closed)

Cons:
Still built on chromium. They have ways to customize the address bar autocomplete, but screwed up the implementation so every option doesn’t work the way I want it to.