Can you notice on a youtube video where someone plays what in 144hz the difference between 60hz. Because I saw son fortnite comparison and there were differences but I think it was only son motion blur
YouTube videos currently have a maximum of 60 frames per second:-)
Fortnite:
Just enter it on Youtube. "difference between 144 Hz and 60 Hz"
YouTube videos all run in 60 Hz, i.e. 60 FPS => 60 frames per second