Here are a few points of differences between the life of a CS student in NSUT/Delhi and life of a CS student in an IIT

• Academic Workload: The first-year students in NSUT and DTU have a laid-back and relaxed experience with no academic pressure of completing assignments, preparing for internals, performing practicals, etc. Whereas IITians are busy with a hectic schedule and rigorous academics right from the first year. They have to be serious about their practicals, labs, and assignments.
• Attendance Policy: Although NSUT and DTU have a 75% attendance policy NSUT students don’t follow and the consequences aren’t very serious. IITs on the other hand are very serious about attendance policies. Students need to attend classes, tutorials, and labs each requiring 75% attendance.
• Curriculum: NSUT and DTU have a relatively lighter and easier curriculum than IITs which have a very rigorous and challenging course syllabus. 
• Campus life: NSUT and DTU have relatively dull campus life than IITs. Students are not involved in organizing summits, seminars, presentations, events, etc. While in IITs the campus is buzzing with some or other activities every day. 
• Hostel life: Unfortunately in India, the quality of hostel life depends on your gender. If you are a girl you will have a full life anywhere whereas if you are a boy you will get full freedom at either place.
• Placements: Placements won’t be an issue if you are a CSE graduate because both NSUT and IITs offer similar opportunities.

Hope the comparison helps you get a better understanding of lives in different colleges.

Both DTU and NSIT are great options for engineering aspirants with good ranks who are unable to make it into IITs. These 2 institutes are at the same level as top NITs, BITS, and IIT Guwahati. Comparing DTU and NSIT, the following points can be considered

• Branch: NSIT is slightly better than DTU in software branches like COE/IT and even ECE whereas DTU excels in core branches like Mechanical, Electrical, and Civil. 
• Infrastructure: Infrastructure-wise, DU is the clear winner with its 160-acre beautifully designed campus and top-notch facilities. Although NSIT has TI labs for ECE students, the overall campus facilities speak in favor of DTU. 
• College Life: Campus life is better at DTU because of the relaxation of rules and a laid-back environment. NSIT has strict rules and students have to worry about attendance.
• Mechanical Engineering: DTU Mechanical Engineering is an excellent choice because of its age-old legacy. The department excels in all aspects be it infrastructure, labs, faculty, facilities, reputation, and placements. The branch can be easily compared with the ME branches of IITs and BITS in terms of placements and education. A number of societies like ASME, and SAE will harness your passion for the branch. 

DTU is an excellent choice if you are genuinely interested in Mechanical Engineering. 

NIT Surathkal is better than Delhi engineering colleges like NSIT, DTU and IIIT Delhi because it offers a more diverse experience. Here are a few aspects to consider

• Reputation : NIT Surathkal enjoys the status of being an Institute of National importance and is fully funded by the Central government whereas DTU, NSIT, and IIITD are state government universities
• Research culture: NIT Surathkal has a rich research culture and facilities and is one of the institutes which is selected for funding from HEFA
• Academics : NIT Surathkal is a clear winner as its academic environment and curriculum are way better than Delhi colleges. Every year many students win International awards.
• Campus life: NIT Surathkal has a private beach with a lush green campus of 300 acres. Moreover, its crowd is much more diverse than Delhi colleges which have 85% quota for Delhites. 
• Location : Situated near the IT hub, Bangalore NIT Surathkal students are exposed to more opportunities and a better IT environment. Many Bangalore IT companies give preference to NITK Surathkal students. 
• Placements : NIT Surathkal achieves 100% placement and has a better variety of recruiters than Delhi colleges. 
• Coding Culture: NIT Surathkal has received good rankings in the ICPC Asia Contest and every year many students are selected for Google Summer of Code.
• ROI : NIT Surathkal offers a better ROI because it charges lesser fees than NSIT, DTU, and IIIT Delhi. 

So, it's safe to say NIT Surathkal is a much better option than Delhi colleges. 

My sister pursued her B.E. in Electronics and Communication from NSIT (NSUT). She was also confused between the two options when she got her JEE Mains rank. Finally, she chose NSUT. These are the reasons behind her decision-

1. NSIT (NSUT) is well-known for Electronics. Before their separation, NSUT was a part of DTU that specialized in Electronics.
2. The faculty for electronics is better at NSUT. There are well-known and highly respected faculty members under whom you can do various projects.
3. The CEDT Lab at NSUT, funded by Texas Instruments is famous in other colleges as well and people from other colleges also enroll themselves to work in the CEDT Lab.
4. NSUT is not as overpopulated as DTU. This leads to comparatively less competition and better placement opportunities.

Overall, NSUT is a better choice to pursue your Electronics and Communication Engineering. 

If your rank is more than 1000, you’ll probably not get CS/ EE in any good IIT. But if you still wish for an IIT tag, I would recommend you go for a more relaxed branch. This means, picking the branch with the lowest closing rank. I am saying this because apart from the CS/EE/Mathematics group, all the branches come under the category of “others”. Unfortunately, all these “other” branches are equally placed.

• The coursework, curriculum, and labs are very bland, boring, and outdated. With these branches, a good CGPA and extracurriculars will be the saving grace for your resume. 
• A lower branch will allow you to secure good grades more easily and you will get time to pursue extracurriculars. 
• By doing courses on Coursera and Udacity and making open-source contributions, you can become skilled and learn in coding/programming. Through various online platforms, you can get in touch with software companies in the valley. 

If you are passionate about a field, be it Mechanical or Chemical, definitely go for it. With a passion for your field, you will secure a good core job or can even plan your Phd. in that domain. I would also recommend you check the integrated MSc. courses in Mathematics/Statistics/Physics. They might be a better and more beneficial choice.

As far as NSIT/DCE/NITs are concerned, I would recommend you talk to some seniors from the CSE/EE branch to get a better idea. Otherwise, go for a lower branch in the IITs if you do not get a “top notch” branch at them.

IIIT Delhi is suitable for students with a passion for research and higher studies. If you aren’t one of those, choose either DTU or NSUT. 

Here is a comparative analysis of the placement statistics of the 3 institutes

If you want to have good placements and enjoy your college life, choose NSUT or DTU. But if you want a rigorous curriculum, and research opportunities and are planning to pursue MS or MTech then go for IIIT Delhi.