my ds is currently on karicare goats milk, but ...

my ds is currently on karicare goats milk, but i would like to try "regular" formula again. my friend just had a clinic visit and they suggested her to use NAN formula. i have also heard they have a HA formula which is easier to digest. has anyone used this and had success or not? i know there isnt much difference between formulas, it really depends on babies, but any feedback would be great!