I really just threw a guess out there cuz both foods are great. I cant say as to which protein type you should feed either. Being a puppy I would think anything should be fine. Allergies dont come on till after they try things so just watch and see how it reacts with your baby. It is good to switch up the proteins in general so unless there is a reason to stay with fish I would switch around a little here and there for the heck of it. So long as you do a slow transition, very slow is what I do actually. Just to be safe.