RED DOT vs GREEN DOT

I believe a background is a factor how can you see a dot colour to make a contrast. A sand/dirt/rocks background may work best with green, a neutral gray (or green leafs, bushes, threes) background definitely a red.

Astigmatism..you better go with hologram scope but those are more influenced by parallax. Still a magnifier can compensate out some parallax but be prepared to stay inside the eye box. Also the combination of two doubling the total price.

I got myself a Romeo7 red dot and the Juliet6 magnifier and works great. Red dot 25 mm and magnifier 30mm lens.
 
...well, when the optic offers the option, I almost always go with red, which should answerer me own question, eh...

...I may not have understood why before but I am generally shooting against dark and leafy back grounds...the red just looked better...more familiar if nothing else...

...the thing I was considering here was the astigmatism/sharpness issue, especially in low light...against dark back grounds...