Different types of cardio will burn slightly different amounts, but in general, the harder the intensity of effort, the more calories you will burn. Don't choose the type of cardio you do based on the estimated fat burn differences. The cardio which will burn the most fat is the one you can enjoy and therefore sustain. This is because the calorie burn is relatively low for the effort you have to expend, so you have to do it repeatedly. But as a broader point, because of interference, cardio should not be the primary vehicle for fat loss, regardless of whether you perform low or high-intensity cardio. A calorie deficit is what controls weight loss, and that is best achieved by dietary control.