120Hz and 144Hz monitors
are better even for 23.976 fps content like Anime/Series/Movies.
Round 23.976 to 24 to make the math easier and then follow this line of thought with me.
Your decoder is receiving 24 images that it has to send to your video renderer and the redenrer has to make a presentation of those frames fit in the monitor's refresh rate in a way that you can perceive it as "motion" right?
Now if we use a 60Hz monitor, what happens? You're getting 60 refreshes per second and your input has 24 frames per second. How do you display 24 frames if you have to refresh 60 times per second? If you display each frame twice you only have 48 refreshes, if you display them three times in a row each then you'd need 72 refreshes but you only have 60.
So how is it done? 3:2 pull-down. The technique is simple: You'll divide the frames in two groups, odd frames and even frames.
You'll be sending your display the same frame 2 times in a row for odd frames and 3 times in a row for even frames.
(2+3)/2 = 5/2 = 2.5
2.5*24=60
Now you have a frame to be displayed in all yours display refreshes! But wait... The source material expects each frame to be displayed for the same amount of time homogeneously but when you do this half of your frames will be being displayed for 50% longer time than the other half. And the effect resulted by it is what we call
"judder" .
You can easily see for yourself how judder looks in this video.
Now, let's display the same 24fps video in a 120Hz or 144Hz display. Both 120 and 144 are direct multiples of 24 and therefore you only need to repeat the frames 5 and 6 times each respectively without any motion artifacts caused by judder since each of the content's frames will be displayed for the same period. That's what the Plasma TV in the video was doing at 96Hz.
But yeah,
you won't get better picture quality, only better presentation.