I used Kodi and now use Jellyfin as client/server - my media is on a local server. The difference (the way I use it) is that with Kodi the server was just a file server and the client (Kodi) was doing all the work. The Jellyfin server is a media server and the clients are very lightweight. I was pushed to move to Jellyfin when I got a new Sony TV - the built-in Android TV experience was very usable but I couldn’t install Kodi - it ran out of space trying to build the media database. I’m sure there are ways I could have made it work, but I’d heard about Jellyfin and figured I’d try it. I liked it and never went back.