I got my pinephone (Manjaro) last week and tried all OSs there are for it; I really love the idea of having a real Linux device in my pocket (that's why I have the Pandora, Pyra + GPD pocket 1 as well); it is such a difference having full control and being able to change whatever how you work instead of having large corps decide. Also shows, by the 'missing apps' between ecosystems, how much we need replacements for all the proprietary social sites, chat, collaboration etc.
However there is a lot that needs to be done software wise, which made me think that if I want to have a solid Linux device that really fits in my pocket like a phone with actual speech and 4g(5g?) then a lot more people will need to help with this. I don't know how that will happen, but, like I did with the Pandora, with this device I will try to work with the community in reporting and fixing bugs.
For now, this is a device for people who like freedom of their device (well, at least as much as we can get with modern circuits) and who like to tinker. I would recommend it to those people who envision an open source phone in their future; we need to help + stimulate the people trying.
Edit: it is trivial to try all OSs, so whatever you buy, you can switch rather rapidly and take them all for a spin.