To answer your question, Nutro is better than Pro Plan, but I don't really like either (I like Nutro Ultra, but that doesn't exist in cat food, yet). You can try Royal Canin if that's the best you can find, but if you have feed stores or lower-chain pet stores (not Petsmart or Petco), you'll find better foods like Wellness, California Natural, Innova, etc. For a kitten, I know California Natural is good as a both cat and kitten food, and I'm pretty sure Wellness has a kitten line. Innova EVO has enough fat and protein for a kitten, but I'm a little leary about EVO for cats, due to what I've heard about high ash contents. Right now I'm feeding California Natural dry and Felidae wet (which they aren't touching
) and I'm going out next month to try the Felidae dry and California Natural wet.
Someone here said that in wet foods, kitten foods should have 5-10% fat and 10-15% protein (levels can be higher, but that's usually where the numbers are at). Dry foods should have 35% and higher for protein and 20% and higher for fat.