Hi Brian –
Serving size is effected by kcals. The higher calorie foods require less to be fed vs lower calorie foods. Perceived quality of a food has nothing to do with this. No two foods will be indentical in kcals, but some will be close enough that the feeding recommendations will not be far off.
Only problem is you have at the very least a large breed puppy if not a giant breed and keeping their weight under control during growth is of utmost importance. For that reason, a low energy density food is recommended by veterinary nutritionists.
