24 fps

Cinema settled on 24 frames a second in the late 1920s, when synchronised sound demanded a fixed speed, and it never moved. Each frame carries a longer exposure than it would at 60, so movement smears a little and the picture reads as film rather than television. In NTSC territories the true rate is 23.976, which matters the moment you mix sources or sync external audio. YouTube handles 24 fps without complaint. The pairing to remember is a shutter of roughly 1/48 second, about double the frame rate, since that is what produces the blur people are chasing.