This article tells you how to hands on evaluate a dual purpose bird. What they are choosing for is fundamental for any of the dual purpose breeds. Wide backs and proper keel. It's the basis for what the Old timers would say "build the barn first then paint it."...
When you pick up the birds to compare keels also compare their backs. You want the back to be wide entire length not thin at tail. Get hands on and compare the two, you can't rely on visual. The body structure is more important than color. That said if the one with better color is on par with...