There's another factor in favor of green:
There's a condition of deficient color vision called red-green weakness. It's not color blindness, but people with red green weakness have difficulty distinguishing shades of reds and greens. There are also varying degrees of the deficiency.
I have it, and in my case it's pretty severe. I enlisted in the Army to be a combat engineer, and I went all the way through Basic and AIT for combat engineering before someone looked at my medical history and decided they didn't want someone who couldn't see red (literally) hooking up colored wires to things that go BOOM. So, just like that, I went from being a 12B20 combat engineer to being an 11B10 combat infantryman.
Fast forward from 1966 to about ten years ago. I put a red dot scope (not a holographic) on my AR-15. Inside the house, I could see the dot, even with the brightness turned halfway down. At an outdoor range, in daylight -- forget it. The dot didn't exist. If I attend a lecture or seminar where the speaker uses a red laser pointer with his or her Powerpoint to emphasize something -- I can't see it. When I do Powerpoints, I take my own laser pointer, which has a lavender (so they tell me) laser. I don't really know what color it is, but I can see it and that's what counts. I can see green dot scopes and green lasers outdoors -- I can't see red.
The thing is, red-green weakness affects a significant percentage of the population, especially males of European descent. As I mentioned, it has degrees, so you may have it and not even know it. So, before you go out and spend good money on a red laser, try to borrow one and try it outdoors to be sure you can see it. If you have red-green weakness, it may not be as simple as green being easier to pick up. It may be that you can pick up the green because you can see it, and you can't see the red.