I would strongly encourage separation of duties. Ideally, your bitcoin and lightning services should not coexist on the same server as general purpose network media services like plex, fileshare, and LLMs.

That said, Start9 is more of a pretty UI appliance, with no intention of users doing custom configurations, though you can side load apps. Umbrel is more of a kitchen sink approach of ppint and click installs.

Personally, I go with a Raspibolt/Minibolt setup for Bitcoin and a standard Ubuntu server for the file sharing