I believe YTCA recommends Royal Canine.
www.grca.org- Supports feeding Proplan
Ask 50 people what they feed their dogs and I would not be surprised if you don't get totally different answers.
I would feed what ever you think is the best for your dog.
My uncle feed his dog Ol Roy all her life and she lived to be 18. I would never feed it but his dog did well on it.