To answer OP, this is why:
https://www.testufo.com/
Which one looks smoothest to you? That page can only show you what your current refresh rate looks like, or slower. If you are viewing it on a 60Hz signal, then it will show 60FPS, 30FPS and 15FPS. One would assume that >60 will be even better - to a point. That's debatable, but I believe for most people 144FPS is obviously better than 60. And you receive more visual information at higher refresh rates. You are literally missing reality at lower refresh rates. Take the above ufo animation example at 60Hz and 1920x1080 (what I'm currently viewing at). The top ufo, which represents 60FPS animation, is "jumping" across the screen 16 pixels at a time and traverses the...