I normally use ironfox, but honestly I don’t really have the technical knowledge to know which one is better. I use iceraven for some stuff because it let’s you use desktop firefox extensions. With ironfox I just use ublock and noscript, I don’t want any extra stuff that can leak data or assist in fingerprinting my browser.
I installed iceraven on a new device a few days ago and I had to turn off mozilla data collection during the set up process.
For the keyboard I would try Florisboard on f-droid, it gives a lot more spacing and sizing options. I basically make the keys as wide as possible and then play with key height. The bottom offset let’s you raise or lower the keyboard as a whole to suit your grip.
I was a long time AnySoftkeyBoard user until a year or two ago when I finally decided Floris was just better. I’ve tried FUTO keyboard a little bit, it seemed fine but didn’t offer enough customization options.
Not exactly the same situation but I’ve noticed that Chrome has moved from only being virtually unusable with my VPN running, to actually unusable. It just refuses to resolve URLs and won’t search, previously it just gave tons of Captcha popups if I tried to do anything. Honestly at this point I’ve just accepted I have to make firefox based browsers work for everything from now on.
As far as I know ironfox supports any extensions normal firefox mobile does, but neither give you access to the full full extensions store. Iceraven is the only mobile browser I know of that lets you use all the extensions that you can on desktop firefox.