4k TV and Android Kodi Resolution

Hello. Has anyone got an idea and which resolution is best to watch Kodi? My TV is 4k but when running on 1080 there is a lot of buffering, 720 is better but is 1080i or 1080p the better choice? I do get a lot of juddering and strobing on sport channels. I have taken off Accelators and this has helped a bit but I think it is my tv to kodi that is causing the issue? TV is a Samsung 55ju6800. Thanks for any help given.