Hello Amal,

See it totally depends upon your choice. If you have interest for big machineries and pumps and all then you should go for Marine Engineering and if you have interest in Navigation and Communication then go for Nautical Science. 

With Marine Engineering you can go to the technical side of the shipping industry with Chief Engineer as the highest rank on board the ship and with Nautical Science you can go to the Deck side on ship which has Captain as the highest rank. After that if you want to continue in this you can continue or you can switch to the corporate office of the Shipping Company.

So, it totally depends upon your interest.

If you have any query do reach out for that , will be happy to help you.

All the best!!