RESISTANT vs just AEROBIC Training
By doing just AEROBIC training you will lose weight, but also your lean body mass (muscle), you will also lower your RMR ( resting metabolic rate).
Doing RESISTANT training you will keep all your muscle, you will lose more body fat and elevate your RMR (resting metabolic rate)
So RESISTANT training helps maintain your lean body mass (muscle) and allows you to burn more fat without dropping your metabolism!