Honestly, both are good formulas kaya hindi ka tayo-yan sis, ang mas importante talaga is which one ang baby mo ang mas okay sa tummy! A few of us tried both, and some babies thrive sa S26 while others prefer NAN, kaya trial and error lang talaga. Kung ayaw ng baby mo or may digestive issues, try mo ang isa, at kung okay, stick ka na there, both will help baby grow well naman. Either way, your LO will be healthy, so don't stress too much about choosing between the two!