Arch is great. The only reason I switched away from it were the occasional manual intervention updates which could just mess up your system if you weren't paying attention.
I was great with Arch on USB, until I started trying to boot to a full UI from the image, and I'd start getting I/O errors from the ramdisk halfway through a 'pacman -Sy plasma-meta' (last three iso releases). That was a dealbreaker for me.
I switched to KaOS (because they used pacman), but their install image fails to install before creating users and installing grub, so I'm back to a Gentoo LiveUSB, which doesn't fail.
Every time I leave gentoo, I'm eventually forced back. maybe Nix will be better.