hello!
it has always been quite the debate.. thou its pretty simple.. i find that seat harnesses are better for riding, they are more stable and don't ride up.. If you wanna do jumps and freestyle you wanna have a waist harness for full mobility.. you'll see that a waist harness allows you to bend and turn much easier than a seat harness.. mystic have harnesses that can be used as a waist and seat harness..