Personally, for me it all depends on whether day or night, clear bright sunny skies, cloudy or how much pollen or silt in the water column etc. I experiment to see which i get more detail with depending on how i'm fishing. Sometimes it's emerald green, sometimes moss, sometimes amber or sometimes blue but always one of those four colors. Most times for me fishing 30 to 40 or so feet deep it's one of the greens because to my eyes i see it better & how your eyes see color is a big part of it in my opinion.