Yet right in this very thread one member insists the bright red balls he bought are easier to see and another suggested the bright green balls he's using are easier to see.Good luck. Lol. I just stick with white because red, yellow or orange balls blend in with the leaves even worse.
Seems counter-intuitive, but I'm reminded of when they put our in-ground sprinkler system in. To make a record of where the lines were pulled I spray-painted them on the lawn, spray-painted direction and distance markers at certain points, then video'd the whole thing. The store had run out of blindingly bright orange or pink or whatever, and had only green in stock. So I used that for part of it. In reviewing the video the green showed up markedly better than the other color.