Holy crap. I don’t, but after seeing that I think I’ll need to start

I have run both Plex and Jellyfin and I much prefer Jellyfin. I got sick of Plex content being interjected into my menus and feed. Plex also had issues seeing my server which was inconvenient. I now run Jellyfin with Infuse as my client. Love it so far.

Dumb question I know, but do I leave this running on my instance or on my own computer?

Just an idea. You could try hosting and using these apps on a VPS from a cloud provider to find out what your needs are.