Science Diet is only good for specialized needs imo. IE Sensitive stomach, skin, prescription. Other than that the line is not worth the money for what they put in. Ol-Roy, bil-jac are all complete garbage. The ingredients are terrible. Wellness is relativly new, so I'm not up to date on that.

What you want to look for in a good food is the word "Meal". Chicken meal, lamb meal etc. Meal is just a ground up waterless substance. So in a meal you are getting 100% real chicken, not water, not chicken beaks and feet.

One of only foods I've found to be good is Nutro.