I personally can't see the red or orange ones well in low light, whereas the green ones seem to glow. I've heard other guys say the same thing, as well as several guys say just the opposite. I think it has to do with the distribution of light receptors in the eye. I'd suggest a little low light experiment if you can get your hands on both colors. Many bow sights have fiber optic pins of both colors, makes it easy to compare.
