Most of the parents would have these concerns what type of milk powder is suitable to the kid, the cost of it & that bring it to the important question of is there significant differences between all these brand of milk powders.
I saw a lot of advertisements from different brand promoting their selling point of they go this and that extra that help the baby to become more ... and so on so forth. So is there any scientific significant proven difference or advantage by taking a more expensive milk powder compare to the cheapest brand of milk powder assuming the baby is tolerance towards all brand of milk powder.

P/S Put aside Mommy breast milk which I know is the best.

You see that the thing. You heard it is better.
I also heard but I am still confuse what the difference an expensive milk compare to those lower price milk. Is it because it contents more nutrien for etc DHA, so the infant or kid will become smarter?