NIT Durgapur is better than NIT Jalandhar. NIT Durgapur is much older than NITJ and thus has more alumni than NITJ. NIT Jalandhar was established later so have better infrastructure but NITD is undergoing massive infrastructure modernisation. As it is located in Bengal and Bengal had produced well known scientist and scholars, so environment for research is good here. And taking mechanical engineering in consideration i will suggest you NITD. rest decision depends on your choice