[doveman2]

60Hz is much smoother than 50Hz when playing 24fps content. In general if you can't choose an exact frequency multiple then the higher the refresh rate the better (the average error in displayed frame time is smaller). Additionally 60:24 gives a 5:2 ratio which allows a regular 3:2 pulldown. 50:24 is much more irregular so looks more juddery.

Thanks for the explanation, I'll make a note of that for future reference.