Hi Crista P.,
From the list it looks to me that your vet is making recommendations based on the guidelines from the World Small Animal Veterinary Association. The WSAVA is a very well respected group of veterinary experts from around the globe. Their nutritional committee drew up guidelines on how to select food which you can find at wsava dot org/nutrition-toolkit Scroll down to the bottom and you’ll find the link to selecting the best food for your pet.
Nutrition experts don’t evaluate foods based on an ingredient list which is how may people evaluate foods.
I have used various products from each of the companies on that list with great success.
