Same and I'm running on a Pi2. It's been running flawlessly for 5-6 years at this point. I always cringe whenever I see just how unbelievably and unbearably slow some built in TV "smart" stuff is. It's especially unbelievable because my setup cost around £30 to "upgrade" my dumb TV (in fact, the Pi was just lying around surplus to requirement so basically free).

I have tried Plex and currently have Jellyfin set up. Plex I removed immediately due to "cloud" login (yes I know you can disable it, I did by removing it). Jellyfin is useful but I still find myself using Kodi directly as it just works.