I assume you've heard of it, but just in case you haven't: you should try Zen! It's basically Arc, but based on Firefox, open source and, more importantly, actively maintained.
(I need them partly because of Google, as Google has a broken login system. I use GGP at work plus a bunch of work apps that use Google for SSO. But for some products like Maps and YouTube, I use my personal account. Doing that on e.g. Chrome is painful, because every URL opens with whatever is your default login, and whatever I set as the default, it's usually wrong.)
Since Google has proven willing to stoop to bad behavior to lend Chromium the impression of superior performance[0] I don't consider subjective performance to be a meaningful benchmark.
As metrics go, I am more concerned with "demonstrable respect for user-agency", a competition in which a browser from the world's largest advertising conglomerate is forbidden entry.
[0] https://arstechnica.com/gadgets/2014/07/why-google-took-year...
I'm the same way. Turn off crypto by default (is it these days?) and that's pretty much it.
I like how they host selected Manifest v2 extensions themselves so uBlock Origin latest continues to work and is actively maintained.
Speed of Chromium with privacy focus. Works for me.
Edit: I also use it as my mobile browser. I really don't see any problems on their mobile app (iOS)