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.
I never had what I felt was good performance from Kodi. Of course it might have just been my configuration across the times I used it, but Kodi always felt laggy / slow.
I moved from plex to jellyfin, both of which feel more snappy