Ok so i here that i should get a bit picky on my puppies food and i dont mind at all...?

so i was wondering if any of you can help tell me which food i should use, right now im just using Iams smart puppy but i saw that these brands are much better: Cannidae, Merrick, Innova, Nate ures Logic and so on. which would you recommend? i have a bichon mix since i havent yet determined the actually mix but it at least gives an idea...i love my puppy and we want the best for him.