Both are great little sights. Buy both at $120 ea., there will be a need for a extra one somewhere. I have used both and as mentioned earlier, both made by Holosun. Some folks get hung up on the Big Company names and they think that makes them better. All that is that the Big Company purchased a large amount from the manufacturer (Holosun) , changed a small amount in the looks, and had the name of the purchaser put on it. That is a great selling point if you ever decide to move the sight. If folks realized how much sub-contracting is done in the outdoor industry , they would be shocked. It is simple business. Somebody that specializes in one product will put your name on it is you buy enough. I remember back when I got started with building 1911's, some folks thought that if the pistol did not say Colt on it, that it was of poor quality. Just the Colt name would bring a premium. Colt made great products and for sure knows something about a 1911
Been there, done that. Back when I was building a lot of 1911's, I contracted with a top barrel maker and had my name on the barrels. The trick is getting a product made from a manufacturer that produces quality. Either sight will serve you well. I myself have a extra Sig sitting at home waiting for a new rifle build. I will use it someday.