Hey!

there are two parts in this answer. 1st is about comparing 2 colleges. 2nd is about course and placements. i would like to answer it from my point of view.

nit rourkela is a prestigious college. on the otehr hand iitdm kanchi is no way inferior. it is also a good college with good reputation. nit and iitdm both are cosly. one or the other way, they are costly. so it now depends completely on course and placements.

metallurgy is a growing branch, thus you could take up masters and then phd and go in research field so that you get a prestigious life. wherein cse is a branch which is in demand among students, which directly implies that there is going to be lack of jobs in the forth coming years. though there are lots of companies, getting a high paid job is difficult. where as in metallurgy, you can assure yourself of getting a job in top companies like, tata steels, sail etc. so there is no lack of jobs in metallurgy. there is a demand indeed.

if you have enough knowledge in metallurgy subject, you have a lot of jobs in foreign too. even in cse, if you have a lot of knowledge, then you might get placed in infosys, wipro and other top companies

so now its upto you to choose. no course is inferior. if you have enough knowledge, you shine. no one stops you from that.

i hope this helps you.

feel free to ask any doubts in the comments