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?
For local use it's handy that those Kodi instances share their database so watched state and crucially how far into the episode/movie you are. You can do a shared database with just Kodi but I don't think that's optimal. Jellyfin integrates so well and handles the database stuff much better imo so I just use that.