Best Food For My Puppies?

I have a 4 month old rescued lab, Wesson, and a 4 month old GSD, Drake. Wesson is expected to be about 80 pounds judging by how fast he is gaining weight. Drake is expected to be about 140 when he is full grown. He gains about 8 pounds a week and rising. What is the best food to feed both of them so that each of them will get all the nutrition that they need. I don't want to have to feed them specialty food for their specific breed like they have at Petsmart because they share food and play musical bowls every meal time. Any suggestions? What do you feed your big dogs? I have had both of them since they were 6 (Wesson) and 8 (Drake) weeks and they have been on Iams Proactive Puppy but I want to make sure that is the best for them.