IIT Dhanbad (ISM) - Indian Institute of Technology (ISM)

I am neither a career advisor nor an educationist. I am an ECE graduate currently working as an IT/Software professional. Also, the answer caters specifically to the Indian engineering diaspora. So take my answer with a pinch of salt.
Short answer-
If you strictly have to choose between these two branches in the Indian academic system, go for IT if you want to be closer to a CSE program. The IT program though contains courses encompassing the management and commercial aspects of the industry, you'll still get the minimum or even more coursework required for a career as a software developer or computer scientist in the future.
ECE is what you get in a traditional EE program at the IITs curricula-wise, minus some advanced courses and those pertaining to heavy/power/systems/high-voltage engineering.
There is no question of better - both will teach you analytical skills - though IT will give you an edge in terms of campus placements in a tier-2/3 engineering college in India (ignore this aspect for a premier educational institution like the IITs). But again if you can write code or learn to write code while not being a CS/IT major, you won't end up broke when the dust settles.