you should combine aerobic and weight lifting wuth a balanced diet.
if your goal is to loss body fat you need to put your main focus on aerobic workout, but still combine it with some weight lifting workout. when doing so you will lose body fat and increase your muscle weight which will help you tone up your body.
i personally exercise 5 short workouts a week, 1 hour each. 3 aerobic workouts and 2 weight lifting workouts.