I've cancelled my subscription yesterday, conveniently it was about to renew at the end of the week, so I have a few days to migrate from Proton, here's what I'm thinking of, but I'd love to hear what other people are switching to
Don't forget to make it rootless
Or, alternatively, use Podman. It is Docker-compatible and doesn't need root at all, even where Docker does.
ARM devices are more beneficial here
For power consumption - undoubtedly yes. For native app support - no. I think an x86 system is a very reasonable starting point, removing as much friction as possible.