Hello Aspirant,

This entirely depends on your personal interest and career goals. MBA and MCA are two different streams , hence you cannot compare them. If you want to take up management roles in future or start your own business then MBA form IIM would be the ideal choice. MCA is also a good choice if you are interested to get into technical software career then it is good choice but you will have a tough competition with software engineering graduates and MSc computer science graduates , hence you will have to put in extra effort to stand out. Also will have to keep updating your technical skills from time to time to stay in valued in the job market. But one advantage here in your options are the institutes , both IIM and NIT are premium institutes for business studies and technical education respectively, so you will get a very good placement if you perform well in the course. In MCA , another point to remember is that many people after completing it may take up M.Tech degree to improve their career prospects. So think about what you want in future and decide , at the end building a successful career depends on your talent and hardwork irrespective of your degree of college.

https://it.careers360.com/articles/4684-Master-of-Computer-Application-Good-MCA-Institutes

Hope this helps