than fat." It's true, muscle does burn more than fat. But its negligible. Unless you are some kind of metabolic freak (which you aren't because you got fat in the first place) you'll never lose more than a few lbs a year by just building huge muscles.
Want to lose a significant amount of weight? It'll take you months to years to get there by cardio alone. It'll take you decades to get their by lifting weights alone. IT'S ALL ABOUT THE DIET.