Well, before answering this question, the heartiest gratitude to all the candidates who have cracked this toughest engineering entrance in India.
The main thing is that you must decide why do you want to join IIT. Is it only for the IIT tag, or you want to follow your passion?
The tagline of IIT is obviously important, but it works only if you are studious towards your dream. Otherwise, it becomes worthless as well as you will ruin the reputation of these institutes, that IIT.
Another important thing to be considered that if you are outstanding in CSE and gets the chance in IIT Dhanbad, then you will be to do more research, over-viewing the facts, like infrastructure and facilities of both of these institutes. However, BITs is generally better, and one of my friends was there for BITSAT 2017; the institute is really awesome.
Additionally, IIT Dhanbad is the old IITs, but it is still an IIT, and it gives the student a great height regarding their future career perspectives. It is properly funded still now and will be better in next year’s. But you should not expect a better life here than BITs Hyderabad. The main thing that should always be remembered is that good institutes always lead to a confident pathway, but you have to go alone in this pathway to fulfill your passion.
Thus, you must choose your branch first; after that, you can move forward.