I can't tell the difference with the dry food but I noticed the canned Nutro Natural Choice has more protein than the canned Max Cat. I only buy certain flavors though because with some of them I can't justify putting potatoes and peas and bell peppers in the food, such as the Salmon and Shrimp chowder or the Chicken Casserole. I just buy the Nutro Natrual Choice Chicken and Liver and the Nutro Natural Choice Turkey and Giblets. Read the ingredients and you'll find that the Nutro Natural Choice Chicken and Liver has some lamb protein added to it. The Max Cat doesn't have that. It has cod fish but the over all protein content is slightly less.