OS's ranked by functionality

[dukla2000]

Wait what?

You mean no su or sudo? What do you mean by no Linux apps? They don't have a repo?

you can use su/sudo but you have to remound the filesystem as rw

UBPorts doesn't use regular Linux apps, it uses apps that are in a closed ecosystem to UbuntuPorts, although it is possible to use regular linux apps, inside a container, if you can ever get it to work (it wasn't working last time I checked). it has a container system called, ironically, libertine, that lets you run regular Ubuntu apps inside a closed container. it's a neat hybrid approach if it ever worked.

Hmm sounds like not the right distro for me

Yeah - I too am underwhelmed by Ubuntu Touch: losing 2.4G of precious EMMC to some Android hangover disk partition scheme seems careless, the 16.04 Ubuntu artefact makes it feel "old" rather than bleeding edge and the having to cope with another application ecosystem (compared to Google Play, Apple's App, Linux apt etc) seems unlikely to converge with my Linux desktop!

I love the lean pmOS philosophy but the apk universe is also relatively (to apt) lean, and they appear somewhat constrained by an installed base that is not PinePhone.

Back to the OP - on functionality I cannot give a quantified/objective ranking but for sure my subjective choice is Mobian by a country mile.