Similac Alimentum is also for colic and spit up.
It all depends on your baby, Some babies may do well with Similac Advance or on Similac Sensitive. All you can do is to try to find the right one. I you have one child and they did well with Similac Advance. That doesn't mean that your second child will do as well with the same kind. My LO is 3 months old and she did ok with the Similac Advance for the first month then she started to get a little fussy due to gas. Then I tried the Similac Sensitive and that did good for about 1 and a half months. Then she started again with the fussiness also due to gas. So She is on the Similac Soy isomil.