Here are the ingredients of Natural Choice - Large Breed:

"Chicken Meal, Ground Rice, Rice Flour, Corn Gluten Meal, Rice Bran, Dried Beet Pulp, Wheat Flour, Poultry Fat (preserved with mixed Tocopherols, a source of natural Vitamin E), Natural Flavors, Sunflower Oil (preserved with mixed Tocopherols, a source of natural Vitamin E), Potassium Chloride, Choline Chloride, Dried Egg Product, Lecithin, Dried Kelp, Vitamin E Supplement, Ferrous Sulfate, Zinc Sulfate, Zinc Proteinate, Biotin, Ascorbic Acid (source of Vitamin C), Manganese Proteinate, Glucosamine Hydrochloride, Manganous Oxide, Chondroitin Sulfate, Niacin Supplement, Calcium Pantothenate, Copper Sulfate, Vitamin B12 Supplement, Vitamin A Supplement, Copper Proteinate, Sodium Selenite, Riboflavin Supplement (source of Vitamin B2), Pyridoxine Hydrochloride, Thiamine Mononitrate (source of Vitamin B1), Vitamin D3 Supplement, Menadione Sodium Bisulfite Complex (source of Vitamin K activity), Calcium Iodate, Folic Acid"

And these are the ingredients to Pedigree - Complete Nutrition (Adults):
"GROUND YELLOW CORN, MEAT AND BONE MEAL, CORN GLUTEN MEAL, CHICKEN BY-PRODUCT MEAL, ANIMAL FAT (PRESERVED WITH BHA/BHT), WHEAT MILL RUN, NATURAL POULTRY FLAVOR, RICE, SALT, POTASSIUM CHLORIDE, CARAMEL COLOR, WHEAT FLOUR, WHEAT GLUTEN, VEGETABLE OIL, VITAMINS (CHOLINE CHLORIDE, dl-ALPHA TOCOPHEROL ACETATE [SOURCE OF VITAMIN E], L-ASCORBYL-2-POLYPHOSPHATE [SOURCE OF VITAMIN C*], VITAMIN A SUPPLEMENT, THIAMINE MONONITRATE [VITAMIN B1], BIOTIN, d-CALCIUM PANTOTHENATE, RIBOFLAVIN SUPPLEMENT [VITAMIN B2], VITAMIN D3 SUPPLEMENT, VITAMIN B12 SUPPLEMENT), TRACE MINERALS (ZINC SULFATE, COPPER SULFATE, POTASSIUM IODIDE)."

Even the first two ingredients in Natural Choice are better than the first two in Pedigree.

I'm not sure how much it is but when you feed a higher quality food, it usually balances out because less can be fed and if the change is drastic enough, there are less vet bills.