You will have to consider quite a few things before you decide between these 3 places. Most of my friends agreed that ECE is one of the toughest branches in engineering.
Additionally, other job roles you can expect from these institutes include managers in various industries. These will highly depend on your luck and personal leaning. You can expect a pay of INR 5 to 15 lakhs per annum. However, a drawback is that these companies look at your academic profile heavily. So if you have a lower grade, it is possible that this could stand as a setback.
Finally, when it comes to Tier 3 colleges NIT Rourkela is better, the job prospects from these colleges are not that great. You can expect to have a salary of INR 3 to 4 lakhs per annum with most jobs in service based companies.