I've used Mobian stable and pmOS stable on both the Librem 5 and PinePhone Pro.
I also can't give in an-depth comparison, but apart from the obvious (differences in available packages, versions and OpenRC vs systemd), I found them basically identical. Both had difficulty keeping the modem connected for more than an hour at a time, but otherwise did everything I expected (wifi, text messages, mobile networks, adaptaive apps, cameras, music/podcasts, etc).
For now, I'm sticking with pmOS, as, for the current stable version, Mobian doesn't offer prebuilt Librem 5 images with full disk encryption support (I can't remember why - this is specific to the device, and I'm hoping it will be fixed in the next release).
I'd prefer having both analogue and digital options for things, but I'm fine with requiring technology, as long as open standards are used throughout. That is the only way to ensure equal and non-discriminatory access.
You should never have to use any particular piece of software, or be forced to sign a terms of service, to go about your daily life. Requiring an app for everything only entrenches iOS and Android, and most apps really don't cater well for people with disabilities or other requirements.
Meanwhile, open standards allow a variety of software to be built that can cater for everyone's needs.