Like MM says formula is formula, different ones suit different babies (I don't understand how one can claim to be closer to breastmilk when your breastmilk changes its make up throughout the babies life to suit babies needs).
My LO sicked up both aptamil & C&G ready to feed, got on fine with SMA ready to feed but then hated it when I changed to SMA powder (thankfully I only bought the small tin) He's now on Hipp powder and seems fine interchanging between that and me.
It's pretty much a case of trial and error and you may get lucky and find the right one straight away.