I suggest you to go for NIT Trichy as it is one of the top NIT'S which is equally comparable to IIT'S and to choose ECE branch will be better for your future. If i say in terms of placements you will get easily with good amount of effort. But overall professors are nice and whether you are in any college professors are only guide you what matters is you self study to prepare yourself for the industry.

Ocean engineering and naval architect i don't think there is much scope even in IIT'S. IF You have other options like already you have NIT Trichy ECE go for that. it will surely help you in future!

best of luck!