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. 

• According to him, 4 qualities that make any institution the best are - Hard work, discipline, humbleness, and the eagerness to learn. The people in the southern state's priorities have these factors more than the people in the northern states.
• The second point to note here is that, unless and until you get to the nerves, the people in the southern states are very calm and polite to you. 
• Most of the people in the northern states, on the other hand, are of a rowdy attitude. Verbal abuses are common here.

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.