Which one should I prefer, NIT Rourkela or DTU?

Both are great institutions and have given many successful students. Both of the institutes have a rich legacy, a strong alumni network and proper reputation.

It is suggested that you go for the institute in which you are getting your desired branch because it matters the most. If you are getting your desired branch in both the institutes, opt for DTU. 

This is due to the location advantage which DTU enjoys. Delhi is certainly a better place in terms of opportunities than Rourkela and you will definitely get more industrial exposure. Even if you are inclined towards higher studies and research, Delhi definitely has more options for proper training and guidance. 

However, it all depends on your priorities and what you seek from your college life. Compare all the things before finalizing your choice. Keep in mind that this will shape your career forward.