If I were weaning a new baby to pellets I would lean towards Harrisons. It's completely organic USDA human grade ingredients. They ONLY create bird food vs. food for other small animals, which to me means they focus more on birds. I would recommend looking at their web sites and you can see the difference. They both have different things they stress as being important so you can see a little bit the difference between the company missions. One other thing ... I know here in the states you can buy Zupreem nearly anywhere but Harrisons has to be bought from an on-line store.