See both colleges are good. and both of them have their own pros and cons, advantages and disadvantages and their own uniqueness. But if i were at your place, then I might go with IISWBM Kolkata college to be on the safer side. It has great placements as welll apart from the infrastructure and good teaching faculties.

Refer to the sites below for more detailed information -

https://www.careers360.com/colleges/indian-institute-of-social-welfare-and-business-management-kolkata https://www.careers360.com/university/indian-institute-of-management-jammu

Best wishes. Thankyou.