If you are sure about your interest in CSE, DTU is the best option for you. However, if you are yet to identify your area of interest then go through the following parameters

• Placement: DTU has ties with huge CSE companies like Amazon, and Microsoft that offer excellent packages to the students even better than Civil at IIT Roorkee. I know many friends from NSITs and DTU that work in Microsoft today.
• Research: The CS department is undoubtedly better in terms of research work and opportunities than the Civil.
• IAS: For IAS, the most preferred branch is Civil. However, if you do for Roorkee, you will have limited options for coaching which can be easily sought at IIT Delhi
• MBA: Again, because of better coaching institutes, IIT Delhi is better to prepare for CAT.

Once you are sure of your inclination making a decision won’t seem so difficult!

The primary step even before deciding on the Institute is to determine which field, or branch appeals to you to the extent that you want to spend the rest of your life in that field. Once you have done that, the next step is to research which Institute specializes in that field.

• For Coding, Computer Science is the best
• For Automobiles, the Mechanical branch is the best
• For interest in electronic devices, the best branches for you are ECE and EEE are the best
• If you are interested in electrical things like motors, and power supply in house EE is the right branch for you.
• If building dams, bridges, and highways interests you, Civil Engineering is perfect for you

Lastly, I will suggest you go for IIT Delhi without much hesitation as it is a complete package, with the much coveted IIT tag, the best faculties, labs, and other amenities.

Top engineering colleges like IIT Delhi, NSIT, School of Planning and Architecture, Delhi, College of Art, Delhi, and even the famous Faculty of Management Studies have branched out from DCE. Major differences between these Engineering institutes include

• Being the oldest, DTU has the largest alumni base ever more than NSIT and IIT Delhi.
• All three have different statuses; DTU in itself is a university, NSIT is under the umbrella of Delhi University while IIT Delhi is an institution affiliated with the central government.
• The companies visiting these institutes are similar in terms of roles and packages offered with DTU and IIT Delhi students getting offers from companies like McKinsey, Bain, etc. while NSIT students getting offers from Tech giants like Facebook, Google, and Microsoft.
• IITians enjoy the brand name that comes attached to their degrees. This brand name is superior to that of DCE.

Ultimately students prefer IITs over other engineering colleges mainly because they are government bodies and have earned global recognition.

I don’t think anyone choosing IIT Delhi over any other engineering college has made a wrong decision given the opportunities and life experiences that come with it. While both are crucial, your choice of Institute is more important than your branch. 

Here is a friend's journey for your reference l was a BTech student (Civil) at IIT BHU with a rank of 3600. 

• First, he completed a Nanodegree program from Udacity in Self Driving Cars and Machine learning
• Next, he worked as a Derivative Trader in Future First where he performed Machine Learning and Deep Learning algorithms.
• After gaining great experience and exposure he joined Quantela Inc for 2 Years where he worked as a Data Scientist.
• Today, after a lot of job switches and immense experience he is working at Derq in Dubai as a Machine Learning Scientist and doing Online MS from Georgia Tech University in Computer Science.

This journey of a 7-pointer Civil Branch student to a high-tech CS company proves that branch does not matter in the end. He made the most of his campus life and kept struggling to switch his branch and eventually succeeded. That being said, you have made the right decision as only IIT Delhi can give you the right set of opportunities and exposure and not DTU.

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.

There is nothing such as a better college. It all depends on where you want to see yourself 10 years from now. But considering the current scenario, DTU is ahead of NIT Jalandhar. 

• Being located in the capital, the environment and culture at DTU are better. You will also get to avail better facilities here.

• You can prepare for TOFEL, CAT, UPSC for which the college institutes in Delhi are best.

Apart from this, the placement scenarios are equally good at both colleges. The only thing better at NIT Jalandhar is its tag.