Honesty, discipline, and the values of the South Indian people and the states make them stand out. This might not be making sense to you, but will definitely try to elucidate the same here. Also, opinions vary among people.
One of my friends studied at NIT Trichy and he has lived in Hyderabad as well.
The students in these institutions are dedicated to learning and so are the teachers towards teaching. Moreover, the rules and regulations are followed strictly in these institutions.