We'll be getting a yellow lab rescue puppy next week who is being fed Nutro LB Puppy food. I was going to wean to Purina One LB Puppy. Any major differnces in the two other than price (and convenience, the closest store that sells Nutro is about 25 minutes away as opposed to 5).
Without seeing and comparing the labels, I think the Purina One is more closely equivalent to Nutro Max while their ProPlan is more closely equivalent to Nutro Natural Choice. You'd probably have smaller size, less bulky stools with the ProPlan than the Purina One. The ProPlan is their better food.
Puff [YF, AKC field line (from competing HT/FT breeder) 62 lbs, dob: 8-'01]