If you’re just starting out, I suggest spending some time at the lower angles regardless of your LOT (BTC in particular, though you may have to ease down to it depending on how loose your skin is). As SNM said, the best and easiest gains come from stretching the ligs. Get whatever you can out of them.
>Now how is SD and SO different?
In SO more structures share the load, so you get less bang for your buck weightwise. If, for example, 10 lbs. is supported by both the ligs and tunica, neither is being stressed as much as if the tension were primarily applied to one or the other.