Primary Arms (even though they are made by the same folks), because of their warranty.
I wouldn't put one on a defensive rifle though.
I talked to our holosun rep and you can guess it.......Holosun makes them for primary arms.
Vortex Sparc AR, lifetime warranty!
Besides size, what's the difference in SPARC AR & SPARC IIVortex SPARC II.
I use one on my duty rifle. I also hear that St. Bernard SWAT uses them. GREAT RDS for under $200. Their warranty is unbeatable, Lifetime, NO QUESTIONS ASKED!
I was so impressed with their RDS, I bought a pair of their Diamondback binocs in 8x42. Completely satisfied! They gather tons of light at night too. I could see all the details on a cat's face at about 200 yards with them at night with just a few streetlights on.