After daily driving it from march to now i can say that in term of user experience it's great ! On the privacy side it's better than firefox since it disable telemetry by default and offer a really good container tabs integration but far from librewolf with resist fingerprinting on.

The team is smaller and has made mistake in the past ( leaving remote debugging on in a release ) but it's nothing egregious for me and I will continue to use it in place of firefox/librewolf.

Following

My biggest concern with these forks, is do they get the security updates quickly enough as they're all downstream from either Chromium, Firefox, or web-kit. I've tried Zen a bit and had a good experience. From a privacy perspective, cookie management, containers, anti-fingerprinting, and telemetry are probably the biggest categories to address.

Again, I always have security concerns for the forks getting patches quickly. The smaller the team the more risk likely in this category. Librewolf won my vote. I use it for almost everything. If the page won't work there, I typically have to use Chromium because the site is just poorly built.

I'd also recommend doing something to manage privacy at the DNS level for your local network/machine. Piehole or NextDNS would be a good place to start. I landed on NextDNS as it's pretty cheap, easy, and stable. With internet, it has to "just work" or the family gets annoyed fast. I can still black-hole traffic from my network that is phone-home telemetry from devices more concentrated on collecting info for the manufacture than doing what they were purchased to do.