Which one should I use for RGB Range on ps4, “Automatic” “Limited” or “Full”?

If you don't know, Automatic. Or you can just try each one out and pick the one that looks best.

Limited tends to be for TVs and Full for monitors, though it depends on the quality of the screen and the colour range it supports.

depends how you prefer the visual representation of your games...that's essentially why there is a choice..

When in doubt, choose Automatic.