ive been using kodi (xbmc was better moniker) since google killed sagetv. i recall attempting plex, but it seemed to lack some open/extensibility (its been awhile).
i have a side project i want to make as a modular plugin generating a cable layout with original air orders and networks/channels… kodi seems most optimal, but ill admit its been a long while since i looked at plex.
so why plex over kodi?
Have you used Plex before? No they don't need to know anything. They sign up and you grant them access (or even just give them a user in your home and they just sign in by texting you a code). It is as easy or easier than signing into your typical streaming app. Just extremely easy. Jellyfin is great and I hope they keep going but they're not at the same level as Plex. I've been using Plex for nearly a decade now and I've tried out jellyfin a few times. I'll keep trying because I don't want to use Plex forever but I'm not going to pretend they're the same. Hopefully they will be eventually.
In the case we are talking about different self hosting things
I used to have Plex with a domain
It's not a problem for me to connect domains, dns, reverse proxies, etc. Because i'm already hosting like everything, email, my own dns server, websites, nextcloud, basically everything