Imo the best app for Jellyfin i Finamp, make sure to use the beta release for the updated UI and general huge improvements. It’s been in the works for a while and works great as a daily driver.

Jellyfin can use a bunch of sources to get metadata for music, some by default others by installing a plugin, but it’s much more hit-and-miss than movies or series. That’s just due to how much more music there is and how relatively worse metadata for music generally is.
Personally, I add a few albums at a time and make sure the metadata is correct using kid3.

Maintainability is probably similar between the two options. Jellyfin obviously can handle other media as well so if you need something to watch movies that would result in less maintenance needed overall.

I used to run Navidrome for a bit, but soon after the Finamp beta started so I didn’t feel the need to go with the broader app selection of Subsonic.