Marine Engineering

Indian Maritime University (IMU) Chennai , Vels Academy of Maritime Studies Chennai and International Maritime Academy (IMA), Chennai are the best

You may find out here:- https://engineering.shiksha.com/be-marine-engineering-colleges-in-india-categorypage-2-62-1-0-0-1-1-2--none-1-0

Both has scope. But where you want to study?

1,marine engineering
2,B.Sc nautical Science
2,Offshore engineering
3,petroleum engineering

both branch have ample future and good placements but as per my prference aeronautical is good

Shajee, go for B.Sc HM or B.Sc Airlines, tourism and hospitality. The course will open up avenues for you in service sector and you can get a job on board of a luxury ship as well as a marine vessel.
There are many good universities offering the courses and also having the privilege of companies like Star Cruises coming there for recruitment.
Check the websites of some good universities.
Good luck.