Similac Sensitive vs Similac Total Comfort

Well, i went and tried the Similac Total Comfort, and omg did it give my son horrible egg smelling gas! And so much of it! He also went the entire day with no BM, and face had red bumps. I put him back to the Similac Sensitive and he is back to normal with regular BM. He still is gassy, but I rather him be gassy and give him gripe water then be on that other stuff. I think it is healthier because of the Whey protein, however my son is happier with this. Better I stick to what I been using. It just sucks they make it with corn syrup, it even taste sweet! This is why kids are so overweight today. Maybe in a few months Ill give Gerber gentle formula a try. Cuz I have noticed my son is gaining weight fast.