Personally, both 50 and 60 Hz are horribly flickery. Back when I used a CRT I couldn't stand anything below ~85 Hz and would get headaches. Now that the screen

Personally, both 50 and 60 Hz are horribly flickery. Back when I used a CRT I couldn't stand anything below ~85 Hz and would get headaches. Now that the screen no longer flickers, I guess in terms of motion fluidity there's a perceivable difference between 50 and 60 Hz. Something I personally cannot unsee, though, is 2:3 pulldown, which is something you don't see in Europe (at the expense of slightly faster movies).