I'm not Ollie but I'd say the main strengths of pmOS is that it's lightweight (Alpine is a small Linux distro) and that it seems to aim to be structurally simpl

I'm not Ollie but I'd say the main strengths of pmOS is that it's lightweight (Alpine is a small Linux distro) and that it seems to aim to be structurally simple (only one package changing per device supported). There's probably some additional strengths in having pmOS as a community-led project, with no need to navigate the bureaucracy surrounding earlier attempts.