I use Jellyfin. A friend of mine told me I should try Subsonic/Navidrome and so I spun up an container with access to the same music as Jellyfin.
I tested Nautiline, Amperfy, and Arpeggi on iOS. It worked fine playback-wise, but as far as I could tell there were no metadata plugins and it got tons of stuff wrong.
This was particularly perplexing since I run everything through Musicbrainz Picard AND THEN two more plugins on Jellyfin, so it should be perfect.
Tl;dr 👇