I actually like SXMo very much and I wish I could choose it sometimes during the booting. I don't use it daily only because it relies on postmarketOS and not Debian.
I've tried pmOS a few times. I really like pmOS and they have a great community (I'm more active in the pmOS Matrix channel vs the Mobian channel), but unfortunately relying on muslc vs glibc can be a bit of a pain (mmsd has some sort of incompatibility due to this), and muslc precludes a lot of packages mobian has without manual patching.