Most stable Pinephone OS

[Chief]

Arch Linux Phosh is a good choice. Most things work and modem and sound reasonably well.
That stated I still use a Blackberry for calls (important).

I didn't try arch because it's relatively close to manjaro and i've had many problems the manjaro OS. That said,  manjaro does not equal arch so i will give it a try. I  use arch as my main OS on my desktop server. 

Fingers crossed. Unfortunately I moved to colombia recently and i don't think there is a recommended provider to use here with the pinephone. There are only two main providers here though and i have sim cards for both in my two burner phones.

Yeah people will experience different results at times from the distro source. I have installed manjaro in the past and it was good. I then later tried another up to date install and it wiped out. I tend to attribute this to bad updates, bad download and that's where region may play a role(?)
I have Manjaro Phosh on one PP and it works near perfectly. I have Arch Phosh on my other PP and it is a main device. I noted that Zeb Walton stated Megapixels crashed on him and this is my point ... Megapixels has never crashed on Arch Phosh - for me. Different results from time to time.
In the next few minutes I will flash Postmarket Plasma to my second PP that at present runs perfect on Manjaro.
Headache #2 comin' up I guess - lol.
Good luck.