Behavior wise I like NGT over either.....I have no experience with ST......NGT is the most outgoing and the least likely to hide. I can only speak from my experience from my 3 IT, 4 ITT and one NGT though. All my Dats beg like puppy dogs at the front when the lights come on....feeding time. All are stable and wagging their tails.....after the meal they all go to the back of the tank or driftwood spot except the NGT who is 100% stable and has no interest in hiding. I have one totally stable IT that always hides. The rest are sometimes stable and sometimes not..