Definitely Taste of the Wild.
My little group loved it and they did very well on it. They gained weight on a couple of other grain-free food brands but TOTW has less fat and calories than most other grain-free brands so they had no weight problems at all on it. I'm currently feeding Acana but I'm thinking about adding TOTW back into the rotation soon.
But, as others have pointed out many times - the best food for your pup is the one he/she likes and does well on.
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He is your friend, your partner, your defender, your dog. You are his life, his love, his leader. He will be yours, faithful and true, to the last beat of his heart. You owe it to him to be worthy of such devotion. -- Author Unknown