My girl has acid reflux and has since then switched to special formula. I had tried Total Comfort from Similac which cost $50 for 600gm. When my girl was <4 months old, I switch her to Enfalac A.R and she has been using Enfalac until now.
My girl is now on solid food most of the time; and only take formula 3 time daily. Do take note that infants will get out of acid reflux eventually, so you will need to switch out of 'special formula'. My little one is 13 months old now, by observation, she is her doing well, therefore, I will be switching her to another brand.
You need to try out a few brands to gauge which is the one your baby preferred.