I only throw one Discraft mold currently (Buzzz OS) but they are, by far, the most consistent company I have seen. They are the second biggest manufacturer (unless you count Trilogy as one entity) but still manage to put out quality discs, every time. If you want a Hornet, grab one off the shelf...it'll fly the same as the last one you had. Lost a Z Predator? No worries...just grab another Z Pred and you're good to go. The only issue I've seen with them was with the Mantis, and I believe they actually retooled the mold after the Ace Race.
MVP and Axiom are right up there as well. I believe that's because the owners have a legitimate scientific background, which allows them better QC than other companies.
Daredevil is good once you figure out their weird plastic blend/mold system. Yikun has been really good, but they also haven't released a wide variety of colors, molds or plastic blends yet. Dynamic Discs is the best of the Trilogy brands, and I have no idea or theory why. Reptilian Disc Golf has been very good so far, which is saying a lot considering they are molded by Gateway. Salient is consistent, though the description of their discs is not.
Gateway is probably the worst, but that is by intentional design. Innova is a very close second.