Technically HIIT dips into glycogen stores while doing it, and causes a slight growth loss (unless you do it on a non lifting day and treat it like a lifting day).
The deal with it is that while you're dipping into glycogen stores slightly whil doing it, it allows the body to burn fat for the rest of the day whereas the long slow cardio (60%-70% MAH) will dip directly into fat stores while doing it but will rely on glycogen for the rest of the day.
Plus, the long slow cardio has to be exactly that- Long and Slow. You should be on the treadmill or whatever for a good 45 mins to an hour for any results whatsoever. Unfortunately, that's counterproductive to gains if you do it directly after a lifting routine because you need calories immediately after to help your growth and if you get calories then you'll just be burning them off immediately with a cardio routine.
My advice is this- do cardio if you want but don't rely on it entirely, you should take a closer look at your diet if you're gaining a lot of unwanted weight.
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