Honestly, I'm baffled by Sig Sauer. They start up their Electro-Optic Group poaching experts from Leupold and they spend tons of money getting it started and yet they spend nothing on advertising and their website is HORRENDOUS. I have two Tango 6's, a Gen1 2-12 and the Gen2 3-18 with the Dev-L. The 3-18 part number on the box is different than what on their website, go figure. And better yet, the manual that came with the Gen2 3-18 is the manual from the Gen1 with NO reference to the Dev-L reticle. It took forever for Sig to release the Dev-L reticle diagram so we know what it all means. Their optics are very good and they would probably sell many more if 1. they advertised and 2. made black versions (which they do, but only on specific scopes).
My buddy has a Vortex AMG and the Sig is very similar but I haven't had them side by side yet. But I also have a Athlon Cronus BTR and have have it beside the AMG and it's as good.