I'm using Enfamil, I trust it more. Bottles that always help with the gas are Dr. Brown's. All formulas can make babies gassy it just depends on the baby but those bottles are made to act more like natural breastfeeding with with formula going through the nipple smoothly.
never used enfamil and don't know anything about it but my boys use Similac and they're doing fine on it, it's the only one they've ever been on so I can't speak for any other brands. just what works for us...
Used Similac with my son it seemed to work best for him. It mixes really well and less bubbles in my opinion. My daughter is using enfamil right now but if she keeps having problems with gas and constipation I'm gonna switch her