Most importantly is suitable for baby.
Is your baby has any allergy ? Immediate family have a history of allergies.
Mine is NAN.
there’s two types
Nan HA is hypoallergenic. It's recommended for babies who could be prone to having allergies.
Suggest you can consult PD or get samples to try ( official website )
i think its depends on baby. Alot of mummies say NAN is closer to breastmilk, but when my LO try, she got constipation everytime she drinks. so we change to similac and it works fine