I'm partial to the Holosun brand. They offer MANY different designs to choose from. Sig Sauer makes a decent dot sight too.
The Vortex uses a 3moa dot size while Holosun uses a 2moa dot size. Better for small targets,
For just a few dollars more, the Holosun is a LOT tougher sight ! DON'T DROP the Vortex sight, you'll be buying another ! You won't hurt the Holosun...at all !!
The Holosun sights have a longer battery life, plus, you don't...have to turn it off. It will turn off by itself, then turn back on when you pick up the gun.
And if you spend a little more...and get the solar panel version...even if the battery does die, as long as there is sun, the sight WILL work.
A good price at Optics Planet now -
Shop Holosun HE508T-GR-X2 Green Dot Sights | 4.2 Star Rating on 17 Reviews for Holosun HE508T-GR-X2 Green Dot Sights Best Rated + Free Shipping over $49.
www.opticsplanet.com
I have a couple of these, they work as designed, never had a problem with ANY of my Holosun sights. I kinda stumbled onto them a few years ago. And so far, have not found, an overall...better dot sight brand to choose from.
And yes, by the way, I DO have a Vortex Razor, but it's been on the shelf for a while now !
Mike