Here are some of the things that make IISER Kolkata stand out. 

Course Choice: You can choose your course from Physics, Chemistry, Biology, Mathematics, even from Earth Sciences. 

Peaceful Campus: The campus is secluded and hence ideal for studies.

Faculties: The faculties of IISER Kolkata are well-known worldwide for their research work.

Friendly Environment: The professors and the seniors are quite friendly. You can discuss any problem you may have with your faculties openly. 

Alumni Network: IISER Kolkata has a vast alumni network. The alumni base of IISER K is better than that of IISER Pune. 

All IISER have their own pros and cons, so there is no use in comparing one IISER to another. IISER Pune has better infrastructure and outreach but that doesn’t make it better than all the other IISER. All these IISERs are great options for pursuing your studies.