You can shoot at either frame rate but the most important thing is to have your shutter speed be twice your frame rate. With 24fps frame rate you will want to use a shutter speed of 50, this is where ND filters come in. Basically an ND filter will allow less light in so you can slow down your shutter speed to be twice the frame rate. If you are going for the cinematic look, use 24 fps, if you want less blur, use the 60fps. Youtube just started supporting 60fps video playback on mobile within the last year and on desktop computers about a year and a half ago. Try it both ways and see for yourself what you like.