These are three very different fields that can not be compared with each other whatsoever. Each of them is prestigious in itself. They can not be put in an order. Still, here are some basic points worth mentioning.

• If earning a decent amount of money is your ultimate goal, it is suggested that you go for IIT, as it will provide you with the most straightforward career path.
• If you aspire to be in a powerful or influential position, you can opt for NLSIU. But this will require immense hard work and practical training.
• If you want to study in a popular institution and their brand value interests you more, go for IIT.
• If you are competent enough, you can opt for NLSIU, as it is claimed to be tougher than the IITs as well.

A more important question that you should ask yourself is “What does my interest lie in?” The way you pursue the course will decide its worth then. You should make sure that you flourish in whatever you do and build a good career out of it.