Each campus of Indian Maritime University (IMU) specializes in a specific field. So, it depends on which stream related to the Maritime field, you are applying for. 

• For Nautical Sciences, IMU Mumbai is the best option after IMU Chennai.
• IMU Chennai campus is best for DNS.
• The Kolkata campus is best for B.Tech.
• For MBA, the Chennai campus is better.
• For M.Tech and Ph.D., the Visakhapatnam campus is better.

You should choose your preferred campus according to the course and stream you are choosing.