If you want to know the different between IT and NTT, please check the chart in the sticky post above. Some already mention the IT bar is wider then NTT.
It depend on the fish. Some ITs are super stable and it is very nice but some ITs are
always look very unstable(it look suck) therefore I would think it depend on the fish.
I prefer very stable Tiger fish whether it is an IT or NTT.
Good luck on your option.