I have been using it for about 2 or 3 months now, bought a raspberry pi 4 and a domain just for it, because it was so easy to use, I am really happy with it.
Check /r/CosmosServer
I dont use it myself beyond being curious about it. But i think its a good choice for beginners to get started with selfhosting the typical things like Pihole and immich. And the dev seems very active.
CasaOS is similar. UmbrelOS is a dumpster fire. Tipi also exists, seems alright. Start9 seems a lot like UmbrelOS, i dont like it at all. Yunohost is kind ot similar to all of these but its a actual OS and it doesnt use Docker to deploy the services.
If you do want to try any of them, imo install and try both Cosmos and Casa (not on the same machine at the same time ffs) and give them a try. Cosmos probably is the best currently but thats of course just a matter of opinion and personal taste.
i only use umbrel for invidious these days and even then it needs constant restarts. i had a lot of issues getting my own docker of invidious to work and gave up
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