It sounds like you probably read my post on RGP yesterday where I said that I would prefer the green to the red for circuit boards if I had a choice. Either that or this is just a coincidence.
Green is the best color if your goal is to sell the most of these. I know a lot of people who prefer green over the red. Some don't want the red at all but I don't think there are any who would feel the same about green.
Personally if I was planning to purchase a new rectifier board (or any other board) for one of my classic Bally SS pins, with all things being equal would buy the green one and not the red ones just because of the color.