Parents Choice vs. Alimentum

Hi! I have a little one (8.5 months) who has been on Similac Alimentum since he was about 2 months old. I was looking into brands similar to Alimentum due to the cost and found PC. Does anyone have any experience switching between the two? Is it worth the switch? Should I just stay away and keep with the Alimentum? I don’t want to upset an already overly sensitive belly that is doing fine with what they are eating.

Thanks!