I am researching same question right now. I've gone out and shot clips of 4K 24, 1080 P 24, and 1080 P 60 FPS. I'll be damned if I can really tell a difference in any of these clips. I realize that some people may be OCD or have professional needs, but I'm just using them to show on my 60 inch LG ,that is set for 1080 P, purely a fun toy application. So I'm not gonna worry too much about which setting to use. I've got a 64 GB SD card so length is not the problem. The only advantage I can see the shooting 1080 P 24 is the file size is a lot less, so it loads on YouTube or other media quicker. Just my opinion, I'm sure other people feel differently.