I have used several distros on RPi4 8GB. This is what I learned: If you want some type of desktop, then RaspiOS is the most responsive out of the box and can be made even better. If your doing pure server stuff, I found Vanilla Debian, or even Ubuntu server are well done for RPi4 and just work. However their desktops are not optimised and way slower than RaspiOS.
Oddly, I have not tried Arch on RPi4, but since mainline 6(.1) kernel, I believe everything is supported including UEFI.
I have several RPi 3’s and 4’s (automated sprinkler systems and mini desktops like I’m using now in my lounge) all running UEFI, booting direct off USB disks (no sd card needed), no fsckery needed. (I do keep UEFI updated from github, but its honestly not necessary now - just how those devices originally were installed.)