The problem with 4k is that the higher definition comes at a ridiculously unproportional cost compared to a 1080p monitor of the same size, and in addition to that, if you were to run anthing at full 4k resolutions it would be hell on your gpu. 4k is kindof impracticalright now imo.
(sorry if my math is forgeted up, I should be in bed now.) At 3 ft, your eye can distinguish an object 0.0105in wide, and on a 24in 1080p monitor, a pixel is about 0.01104 in wide. The difference between the two is 0.00054in.
If you are looking at a 24in 4k monitor, the size of each pixel will be (approximately) a quarter of the size of those on a 24in 1080p monitor. Your eye can't really take advantage of the higher resolution because it simply cant distinguish at 4k resolutions on a 24in monitor from
10my bad im sleepy 3ft away. You are better off getting something at like 1200p instead.
This article basically elaborates on what I just said.