I've been using yellow Trijicon HDs on a couple of carry guns and they're good. Not great, but good. It's the basic "3 dots across" deal. Using both eyes open, I find it takes me a few seconds to see the rear sight while focusing on the front sight. I put a set of Ameriglo CAP Sights on a new gun and noticed something. First, the yellow paint on the CAP sights is WAY brighter and easier to see than the Trijicons in every lighting condition. But the best thing for me is the yellow bar painted at the bottom of the rear sight designed to help line up the front and rear vertically.
I find this setup faster for me and also from a defensive standpoint, vertical alignment is more important than horizontal. If I'm off a little vertically, my shot will be a little high or low but still a hit. If I'm off horizontally, I may miss completely either left or right. So, I'm thinking of replacing my Trijicons with either more of the CAP sights or something comparable. Opinions?