Trijicon SRO. Buy once, cry once, but you will be using it until you die. (Hopefully of natural causes.) SRO over RMS because only the good die young and you've been very bad and your eyes will age because you been looking at naughty stuff all your life. You were warned as a kid it would make you blind!! It's true! LOL
If you want an interesting option, look at Shield Sights. The UK military uses them and the cost is not that bad. I might for my .22 PPQ.
I looked at Vortex and they are merely ok, Vortex seems more a marketing company that builds average China stuff and backstops it with a better than average warranty. If driven hard, well I had two fail at critical times, so no more Vortex for me. Good range toy is all.
I also find Vortex quality to be all over the map, especially with their scope glass. The Glass in optics is better in the center but quality falls off rapidly toward the edge, so you lose peripheral view. What I saw suggested they also darken toward the edge either to cover for the poorer quality, or WTF, I don't know why, but deer will walk into the frame of the optic from the edge. If you are committed to Vortex, have them bring you every copy of the model you want to buy, as you will have to hand select the best one. Don't believe me? Well go check out a few of the same model side by-side and look into dark areas in the ceiling of the store as well as the bright outside the front door. Look especially in shadowy areas of the store using the edge of the glass, away from the crosshairs. Some will be ok, some suck. There's no quality control.