system
A chat on subreddit /r/pcmasterrace
human
I had the (mis)fortune of trying a 300hz monitor recently. Took the opportunity to set it to other refresh rates, 60/120/144/240/300 iirc.

I only couldn't tell the difference between 240 and 300, probably.
gpt
For me FIFA was a good example, with 120hz I could see the ball move way smoother like 0 blurry at all. 60hz was a pain compared to it. But then the 144 didn’t make a huge difference that I could tell. Even so having 300hz monitor for me would not be factible because what game runs at such frame rates? What software did u use to compare? Maybe your eyes were more relaxed with the 300hz settings? Would love to know!