Earlier quoted context omitted.
I agree that having higher PPI is great, but are you using scaling to make text larger? I was barely able to use a 28" 4k a 100%, can't imagine doing that at 24"
Yes, I should have mentioned that I'm using Windows 10 with 225% scaling on both the 4K UHD 24" display (187 DPI) and the WQHD 14" (210 DPI). Some people like a bit less scaling, some more, but in general you want a scaling factor that roughly matches your display's pixels per inch. The original Windows "standard display" was assumed to be around 96 DPI. That's the monitor that 100% scaling (i.e. no scaling) is inten…
That’s not how it works. Lower dpi does not somehow give you more real estate!
You should still be running with ~200% scaling because you are viewing it at a greater distance.
Optimal viewing distance, assuming 16:9 ratio, is 120 cm vs 140 cm for 24" vs 28", respectively[1]. Accounting for the difference gets you ~155 ppd with both monitors[2][3], maintaining 25.0° horizontal viewing angle.
The closer your viewing distance the more ppi you need for the same density. That 28" is not inferior to the 24", when you account for distance, despite the lower ppi, because the greater viewing distance makes the pixels look smaller, thus creating more dense image.
[1] https://en.wikipedia.org/wiki/Display_size
[2] http://phrogz.net/tmp/ScreenDens2In.html#find:density,pxW:38...
[3] http://phrogz.net/tmp/ScreenDens2In.html#find:density,pxW:38...