Is 4K better in low light?
A lot of this will depend on the camera you are using to shoot 4K video. 4K has four times the resolution of 1080p, but pay attention to if the camera you are using is shooting 4K at a crop as many do. Ultimately shooting in true 4K will allow you to capture more details within the frame, but you will need to record to an external recorder for the best results.