I'm not sure about ingredient comparison but I have always used S26 Gold with my 2. However, I know you don't want to use that one but the other one I have heard is a good one is Nan HA formula. Meant to be gentle on little tummies who are used to breast milk and I don't think it's meant to bind them up as much as some formulas can. This is just what I've heard about it and don't have any experience with it.

Good luck in finding the right one! Such a daunting thing walking into that isle with so many tins staring at you all saying they're the best one!!