Should I go for NSIT IT or IIT Jammu Mechanical?

No matter what anyone says, one cannot underestimate the value an IIT tag holds in shaping your career and opening doors of opportunities you did not know existed. You will have a certain confidence over non-IITians and you will thus strive everywhere you go. Moreover, the quality and number of recruiters an IIT attracts is unmatched. 

IT at NSUT Delhi won't do you much good because CSE has overtaken IT and is no longer the most coveted branch. The mechanical branch however still has its charm and will continue to do so in the future. So it's not advisable to join a branch that is losing its charm gradually. Here are some additional points to consider

• The campus facilities are also better at IIT obviously because it's a government college. 
• Students have access to the internet 24/7 which is not possible in NSUT Delhi. 
• IIT Jammu has amazing sports facilities like a cricket net, football ground, badminton courts, basketball court, table tennis room, volleyball court, chess, and carrom. There is also a TV room with all HD channels, for recreation. 
• Students are offered laundry services too. 
• Several cultural and technical clubs like drama, dance, literature, art, music, coding, robotics, etc. promote extracurricular activities largely.

The above points might have convinced you to choose IIT Jammu over NSIT.