cals in vs calories out, low intensity are you burning fat mostly yes, but in matter of total cals and fat high intensity will burn more calories quicker, are you going to lose much muscle from doing HITT some but little, are you going to burn some muscle glycogen during low intensity some but little, I like to do both, swolecat on the other hand, if anyone remembers him is all for low intensity, he looks better than me and has many rebuttles to back up his answers.

my 2 cents