It's 163. I think the 218 you got from a Cmd-F and picked up the SEO blurb for the 5k ultra fine in the footer).

I cannot tell the difference between the LG and my MacBook's retina screen at my normal viewing range, but this may just be my eyes.

I also use a non integer scaling factor on both screens as I find it has the right combo of resolution and real estate for me, and I don't notice artefacts.