science diet isnt as great as they make it seem. Just cause it says science doesnt meant it's truly above the rest. Feed it what it likes, but feed it what you know is good for it (for it's age group etc)
Nutro is good, also switch his food slowly over a week or he might get the runs, do like 3/4 reg for a while then 1/2 and so on over a week and it usually prevents it. I have had a lot of dog and cat runs on my carpet over the years by forgetting.