anything about them..... Which dry food is considered the best?
Everyone has different opinions so the best food for one might be different than another. Also each dog's system is different & each dog has different needs so what works well for one dog may be a poor diet for another. The foods you mentioned are all very good quality foods & one I would add to that list is canadea.

I feed Nutro natural choice large breed to all my dogs, I was going to switch the nutro natural large breed senior as all my dogs are over 5 but the first ingredient is not meat I do not like that personally, I was also going to switch them to eukanuba large breed senior but that does not have enough glucosamine & chondrotin in it as 2 of my dogs have leg problems (arthritis, cruciate repair & permanant fractures) & the levels in nutro are much better for my dogs. My main reason for not switching foods is that my dogs are all doing very well on nutro so why screw things up. They have healthy teeth, gums, coat & active energy, healthy poops etc.. If your dog is doing good on his diet than I would personally stay w/ it!