I use Mull and since it's Graphene OS, there is also vanadium (chromium based). I try fennec, but I think it's because Graphene uses a lot to block other google services.
Edit: maybe because I have vanadium webview instead of android webview
This is c/privacy, so I must ask: do you know about Kiwi's shady practices?
In the past they redirected searches through their own servers, disabled adblockers on search result pages, and they were also caught contemplating about farming attention and directing users to partners.
I don't know if they are still doing these, to be clear.
If you didn't know this, and now searching for an other browser, the repo of these issues is an app that that is basically a browser repository, and it can update browsers and such, but more importantly it has short privacy notes on each supported browser.