Both have similar Nutritive Values. No major difference.
It depends on the purpose/ Goal . Eg if the goal is to ensure proper growth in terms of Height . He needs not only protein but also
calcium .If you wish weight gain , he/ she needs protein and carbohydrates, vitamins n minerals.
Next Steps
Therefore , you need to connect with Dietitian directly or you can consult me .To know better
Health Tips
Also , go for probiotics like curd, buttermilk.