Dog Nutrition – High Proteins?

Does anyone know the nutritional requirements for a medium to large breed puppy and adult?
I am buying puppy food just now and am looking at 2 dry food brands (I am not going to mention names).
No. 1 – has 70% meat products with 42% protein and 16% fat.
No. 2 – has 32% meat products with 24% protein and 12% oil.
Both have only natural ingredients and no additives and claim to be 100% digestible and use high quality ingredients. Both are also of similar price.
What one should I go for?

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