Not sure what's difference between 27UP550N & 27UP550N-W but it seems to be a decent monitor that ticks the basic boxes.
Specs:
60Hz
LG 27UP550N-W 27inch 4K UHD IPS LED HDR Monitor, 3840x2160, 5ms GtG, 1000:1 Contrast, 300nits, 2x HDMI 2.0, DisplayPort 1.4, USB-C with 90W PD, Headphone Out, sRGB 98%, HDR10, AMD FreeSync, On-Screen Control 2.2, Height, Tilt, Pivot, VESA 100x100
I believe -W usually means that the back of the display housing is white instead of black on LG models