I'd like to know the same thing, JWM. It seems odd that this would be the case since the active ingredient is the same. It was my understanding that the delivery medium (foam) made it more effective. Is this correct? I'm a little different in my thinking because I usually look at the active ingredient. Since they're the same I went with the foam because of the claims of the company and also I use it as a replacement for mousse/gel. It's great for styling hair and when you brush it out it makes your hair look fuller. Smells good too!