Here is some information to assist you in choice-making-
Snapdeal, Amazon, Google, etc. visit IIEST Shibpur and offer equal placement opportunities to both IT and CSE students. My roommate from IT got into Snapdeal through campus placement.
IEM isn’t a well-known college. It is a local college unlike IIEST, which is an institute of national importance. The campus size of IEM is very small. Big companies don’t usually visit small colleges like IEM.
The college tag has a value of its own. Besides, the opportunities and exposure offered by IIEST are immense.
Thus, I would recommend you opt for IT at IIEST Shibpur.