Nutramigen vs ProSobee? Which should I use?

JAG 👼🤰

Thoughts on nutramigen vs. ProSobee? My son is primarily breastmilk fed and gets formula supplemented during the week at day care when I can't pump enough. He has very bad gas that seems to be getting worse. He wakes up in pain at night and also during the day at school. His daycare teacher suggested I call the pediatrician. We've already tried 3 gentle/gas friendly formulas with no luck. I cut out dairy from my diet so now we need to get a formula that will also cut out lactose and milk protein. The doctor recommended we try Nutramigen or ProSobee and I'm not sure which one to go with. Anyone have experience with either formula?