Between NIT Jalandhar Mechanical Engineering and DTU MAM, the latter is the better option. This is because the placements for DTU mechanical are excellent. Some of the most reputed firms that visit the campus are Bajaj, Volvo, Daimler-Benz, Brahmos Aerospace, Technip, Schlumberger, Caterpillar, etc. Most of my friends from the same branch were able to secure amazing packages at top firms.

The learning process at DTU is more extensive. It has a lot of Mechanical Engineering teams which can help you know your branch better.

So choose DTU over NIT.

Comparing the two NITs we know NIT Trichy has a better ranking than NIT Jalandhar. It also holds a stronger brand name. Unless you are extremely interested in Software, I suggest Production Engineering is a better choice. Some points to prove my opinion are:

• NIT Trichy ranks in the top 15 engineering institutes in the country from a placement perspective.

• More companies visit for campus placements like Amazon, Microsoft, Flipkart, and Cisco.

• NIT Trichy has an upper hand in faculty, infrastructure, competitive environment, peers, resources, curriculum, labs, and alumni network.

• Many finances, banking, consulting, etc. based roles are offered at NIT Trichy and these opportunities are considerably low at mid-level NITs such as NIT Jalandhar.

• Post Graduation, if you wish to switch sectors then the brand name of NIT Trichy will help you along the way.

So don't lose a much stronger brand simply because of a simple stream issue. Years down the line, your credibility will be determined by the brand of NIT Trichy solely and not by production engineering at NIT Trichy.

NIT JALANDHAR CSE should be prioritized over NIT JAMSHEDPUR CSE and NIT PATNA CSE. If you look at their placement, you'll see that there isn't much of a difference between these colleges when it comes to this branch. All you need is good infrastructure and a welcoming atmosphere; otherwise, sooner or later you will find yourself regretting your choice somewhere on campus. When discussing the infrastructure of these colleges, you must consider their NIRF ranking.

To be honest, NIT Patna's campus and facilities are fairly mediocre and unsatisfactory. Then there's NIT Jamshedpur, which is right next door. It, too, needs to improve significantly. However, because it is located in an industrial area, it attracts a large number of students who study Electrical, Mechanical, and other related fields.

Plenty of coders on top competitive coding platforms are students of NIT Jalandhar. This points towards a good coding culture at NITJ. Moreover, the fee at NITs is much less than PEC or Thapar University. 

Though the placement at PEC is good overall, it receives less offers from the core ECE companies. Thapar has its own list of top companies that prioritize it over other colleges. But I do not know much about their CSE department. 

Thus, I would recommend NIT Jalandhar CSE over the other two options. But if you want to choose between PEC ECE and Thapar CSE, I would recommend you make the selection based on your subject interest.