Heritage Institute of Technology would be a better choice. Since it has become autonomous, it has advantages over institutes that are under WBUT.

• Heritage will provide you very good exposures in both from the academic and the industrial point of view. 
• You will also be aided in your research and project oriented internships from the faculty. 
• It is one of the best institutes for pursuing engineering not only in Kolkata but in West Bengal. 
• The environment of HIT is also excellent for studies.

A lot of my friends studied there and they are very satisfied with the education and training they received. So it is suggested that you go for Heritage Institute of Technology.