The machining process is what sets Defiance apart. Most companies machine, then heat treat (heat can change tolerance's a bit). Definance heat treat's, then machine's. Every other build I do is with Defiance. I always get a wild hair to try someone else, then remember why I stick to Defiance and go with them for the next, then get another wild hair.
My last was on a Pierce, and its by far my my least favorite.