what's the best formula

Hi momsh. I really need your advice. I am giving my baby Nan Infini Pro because he needs to have his milk with HW content but of course it's pricey and I am thinking into switching his milk when he reached 3 months old. I am asking your help to give me some recommendations and how's your formula benefited your babies. Thank you. #firstbaby #pleasehelp #advicepls #1stimemom