No hate on FF mobile from me, but I can objectively say Chrome, at least visually and subjectively, performs noticably faster than FF. That said, I still prefer FF over Chrome.
My mobile FF install runs uBlock origin, which blocks youtube ads btw, this is enough for me to use it exclusively. That it syncs with my desktop FF is just a nice bonus.
I was happy with chrome performance. After switching to FF, based on the accolades on Lemmy, I've been mostly happy... But fuck if there's not major lag at times. It isn't connection related, as I've immediately popped over to Chrome for that site and had no issue.
I'm not unhappy with Firefox, but I notice it's presence, which is not what I want in a browser.