I've formula fed 3 kids now, and all of them have been on different ones - different digestive systems so they all work in different ways.

DS was happy on S26 Gold. No constipation issues.

DD1 was constipated on every formula bar goats milk formula.

DD2 vomited on most formulas, but vomited the least amount on Heinz nurture.

So it definitely depends on your baby.