I have to agree with the others. Out of my mum's group, all the bubs were are different formulas - some just responded more positively to a specific brand/type than another. Strangely enough, all except for one didn't fair particularly well on S26.

We used NAN HA Gold just because it is easier on bubs tummy (the milk protein is already partially broken down which makes digestion easier). As it happened, our DS ended up on a prescription formula because he was allergic to cows milk protein (but that is besides the point). After he outgrew the intolerance we popped him back on NAN HA Toddler milk - again, just because it is easier on their tums.

Down side is that it is pretty expensive.

What issues are you experiencing on S26? Perhaps if you give us more details we can share our experiences and make more appropriate suggestions?