Interval training also has a more positive effect on your metabolism for a longer period of time compared to monotonous jogging or low intensity stuff.
Low intensity exercise may effect your metabolism for say 3-4 hours afterwards, whereas HIIT effects your metabolism for about 15-24 hours after. Sometimes maybe even longer.
And there's also a more positive hormone state achieved from HIIT compared to low intensity i do believe...
Now, one little thing i (would) do, is if you're on really low carbs then just stick to low intensity stuff cause you're probbaly already in a fat burning state. If you've carbed up the night before, or you're not doing a low carb diet, then do HIIT cause anaerobic exercise uses primarily glucose for fuel, so this way you'll have glycogen stores to use and you won't be tapping into muscle reserves.
So for instance, i'm gonna do a cut where i do mini-carb loads after training. So if i do cardio the morning after training, i'll do HIIT cause i have glycogen available to fuel it. If i haven't trained the night before then chances are my glycogen stores will be low and i'd risk eating into muscle if i did HIIT, so instead i'd do low intensity exercise for a longer duration.
This way exercises both metabolic pathways and would no doubt have positive aspects on your cardiac conditioning.
I'm not saying this is
the way to do it, but it's something i'm gonna employ when i start cutting...~sigh~...tomorrow...