Similac vs Enfamil

Lorianna 💙🥰

So my son is 6 months old and he has been spitting up a lot after he drinks his bottle up until now I had been using similac pro advance but he throws up quite a bit. So when I went to his pediatrician she stated to change his milk to Similac Total Comfort to see if that would remedy the problem. But after walking around the store i decided to get a small can of enfamil to see if that would be easier on his tummy. Now I’m thinking what is the actual difference in the milk and what can I do more of? I give him 4 oz every 2 hours just so he won’t spit it all up and burp him immediately after.

Any tips or advice is appreciated