I have patterned Carlson, factory Benelli, Briley, or Pure Gold. The Pure Gold pattern tighter and when we tried buckshot, was the only brand to put more pellets on target than the other brands. Its a small company from SC that does some sponsorship in the carolinas (I don't know about other places) and Pure Gold is popular here. There spreader chokes also are efficacious. I have not patterned any other brand of spreader type choke.
I highly recommend shooters pattern all there chokes at various distances for 3 gun. I disagree that light mod for 90% of shooting in 3 gun is an effective strategy. I change chokes a lot.
If I was shooting distance like duck hunting, I would get Pure Gold. I have met guys that hunt deer with buck shot and dogs and they pattern every brand trying to find what works best for that mission, also turkey hunters that have patterned a lot of chokes.
In summation, I guess my experience is most chokes are very close, with Pure Gold being a little better.