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I like red, some say that green is more natural for the eye, however there isnt lots offered in green and in some lights and surroundings green can wash out abit.
Get a Holo that supports both red/green! im colour blind so i lose the red in brighter conditions, but see the green just fine and the red works well for me in low light....Problem solved!
I've used both, and found that no matter what the light condition I could see red better than the green. I stopped using the green all together as I found it much faster to acquire a target with red.
might be my eyes, but I am not color blind nor do I have any vision problems.