Gel vs. Mousse— what’s the difference?! Gels usually provide more definition, shine, and hold. Most give you a gel cast which is what ensures that your style will last multiple days! Mousses are more for volume & soft, flexible hold. These typically aren’t as strong as gels and won’t hold your style more than a day or two. I guess it all comes down to personal preference! I personally loveee the volume I get from mousses, but the hold I get from gels. I usually use both so I get the best of both