Remote access is the single area where Plex is better. Even then, it's not that you can't do it with Jellyfin; it's just harder to set up.

Everything about Jellyfin is free. This includes hardware transcoding, which is subscription based on Plex.

The Jellyfin apps are also much better than they used to be. I'd say easily on par with Plex now (the native Jellyfin client and the music app, finamp).

To me, it seems like a really hard sell when Jellyfin effectively does everything that the paid service does for free.