I really like the Firefox usability. For what I do it works great. It has uBo and a bunch of other extensions, and if course it can sync with desktop.

I would actually argue the exact opposite. All of the Chromium-based forks are a usability disaster. I have to use grid view only to see my tabs? It took them most of a decade to finally get the relatively common place bottom bar, and it still arbitrarily decides to ignore your setting if it thinks your screen is "too big"? It's just failure after failure. I absolutely dread when some shitty site I'm forced to use refuses to load in anything but chrome and I have to open up Vanadium for the first time in forever.

I'm using Firefox mobile for many years exclusively (since chrome forced some stupid feature on me, I think it was tab groups which I hated and couldn't turn off. And of course no ubo). Could be a bit faster probably? Otherwise don't see any issues.