Help with choosing a monitor for games / movies.

I'm going to buy a monitor of 2560x1440 pixels, the scanning frequency does not matter, the matrix is most likely IPS preferable, since I read that the picture is much richer. I would like to know if the pixel response time is critical? At the moment I own a monitor with a 2 ms response , i tried the monitor asus mg279q 27 with a 4 ms response. So will it be noticeable, as many say in the reviews on YouTube? In general, personally it seems to me that normal people cannot notice the difference of 3-4 ms between TN and IPS matrices.

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