144hz monitors are just 60hz monitors but they cost more cause they want more money and you think "i have 144hz monitor i can see enemy better now!" it doesnt work like that... You can buy 30hz monitor and play with 30fps it looks same like playing 300fps and 144hz.
it doesnt change the fact that human eye only can see 60fps
"The human eye is an organ that reacts to light and has several purposes. First of all, human eye cant see more than 60fps" This is a fact from Einsteins diary.
cant speak for 240 hz, but once you go up to 144 hz you wont notice anything until you go back down. There is definitely a difference, but it takes a trained eye.
I would recommend a 144 hz monitor for sure
Its hard to explain when you first get a 144hz monitor. Everything just feels clearer and more immersive.
You get used to it after about 20mins though and then I started to question whether it was even worth the hype etc..
..and then i switched it down to 60hz and almost had a seizure.
Its worth it.
If You are moving from 60hz to 144hz it will be huge difference.
If You are moving from 144hz to 240hz - its small difference. It is there but its small.
If You have money then just buy 240hz, if You're saving for something else then just buy 144hz and You will be very happy