Green > red for older eyes. much crisper and easier to pickup. - Viridian Weapon Technologies RFX-15 1x21mm Micro 3 MOA Green Dot Sight

I recently purchased the Shield SMSc and had it mounted to my Hellcat pro. The Shield is a great sight, but I didn't care for the auto adjustment feature of the red dot. The red dot adjusts to light based on how much light is present. I ordered the RFX15 because I was interested in how my eyes would pick up the green dot over the Shield's red dot. The RFX's green dot is much brighter and easier to pick up on the drawn. So far, I prefer the green dot over the red. I need to do some more target work to see. This site also has a manual adjustment, which I like over the auto adjustment of the SMSc.