While I understand why people recommend against changing food frequently I'm going to stick my neck out and say it might not be a bad idea to change sooner than later. The main reason I say this is that Hill's just doesn't seem like a great food. If you are feeding this until 1 year-old it's a long time.
The biggest ingredient is maize, not a great ingredient because of the poor relative bioavailability of the proteins, and the fact that grains can't provide all the amino acids needed means that they shouldn't be a primary ingredient. Maize is also one of the bigger culprits for causing allergies. Dogs evolved to eat a mainly meat-based diet -just ask the BARF advocates, and high grain recipes are more about low cost production than quality nutrition. Also, the meat is not fully identified other than as poultry (of which min 30% is chicken), and it does not identify the fats other than as animal fats. On top of that it uses beet pulp (low food value, allergies) and some unnamed digest (of what?) presumably to flavour the food.
There are many much better foods than this for your puppy though, as you say, it is a bit of a nightmare deciding, given the number of views about the best foods to feed.
One final rant: the fact that there are puppy formulations in the first place seems to me to be driven by two things. Firstly, the marketing approach of creating niches to add apparent value to the product (Hill's are masters at this). Secondly, the fact that most dog foods are now so low in protein and fat, due to the high grain content, that the food that is sold for adult dogs is no longer nutritious enough for puppies. I'm sure that dogs in the wild didn't create a special food for their offspring. If you look at the better quality grain-free kibbles (Taste of the Wild, Orijen, Acana etc.) you will see that they meet the requirements for nutrition for dogs of all life stages. You could feed your puppy one of these (giving more than recommended for an adult dog) and continue it throughout their adult life knowing that the quality of ingredients is far better than those used by Hill's.
