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.

I’ve been using Vivaldi as my primary browser for years. My favorite feature of Vivaldi is its powerful sidebar. It’s a great browser, but because it’s based on chrome, ublock origin will eventually stop working on it. When that time comes, I’ll be switching to a Firefox based browser. I’ve been keeping my eye on floorp, but it’s not quite where I would like it to be yet.

When I have a reason to use a Chromium-based browser, it’s usually Ungoogled Chromium. Otherwise, I use Firefox, and I’ve been playing with Waterfox in case Firefox ever asks me to agree to the terms of service that were discussed a little while back.

I use LibreWolf and SearXNG as a metasearch engine. I like both. They get the job done. I wouldn’t use Vivaldi, since it’s not Free Software. But that’s personal preference.

if you really want to stick it to Google you have to go for Firefox or something derived from it. Chromium gives Google a ton of leverage to push features to all of their downstreams. not sure what engine these are using, but i also prefer to use Firefox because it’s open source. if these were open source you could easily see which engine they’re using.

FireFox or it’s many forks.

I’ve been using Firefox ESR. It’s stable, reliable and ublock origin works great on it.

My buddies are trying to get me to use brave but I’m hesitant. I’ve been using Firefox since it was Netscape.