I only have experience with Start9 (npub126n…e9ll) but my experience has been outstanding. I bought a couple different versions of their hardware and have learned a ton, starting from basically nothing—I am non tech. Their customer service is outstanding on Telegram. Once their next OS upgrade comes out I think it will define the standard for self-hosting and ease of onboarding. Look up Matt Hill and listen to some of his appearances on various podcasts (Stephan Livera would be a good example) to learn about their unique ethos.
The developers know their stuff and are breaking new ground in this area…. Very cool to watch.