Why not both? I use kodi when possible because it runs circles around the mostly dogshit Jellyfin apps for various platforms. Jellyfin for kodi and the kodi queue sync plugin import my library and watch status. I still have the option to use Jellyfin apps or web on devices that can’t run kodi (or when remote) and as a result can have all of my media accessible from all my devices without needing multiple copies and centralized metadata administration