I didn't use S26, but when I was in the hospital the nurse said S26 is more for boys, and A+ is for girls. I have used 雪印 at the beginning, but it has alot of air bubbies when baby is drinking it!! Which makes baby vomit easily, because she can not burb. And A+ is better for her.
My daughter changed to 雪印 after I breast feed her. She would not drink other milk but 雪印 only. Even the doctor said 雪印 is less sensitive and good for asian babies.
My sister's elder son also has 雪印 and the younger one has A+. I think it all depends on your baby.