First of all, to clear any misconceptions, IIITH, IIITD and IIITA are not connected in any manner. Out of the three, only IIIT Allahabad is a member of the actual collective known as the IIITs. 

The common public doesn’t know much about these prestigious colleges. Consequently, they aren’t valued as much as the IITs and NITs. Here are the reasons why-

1. All these institutes offer very few branches, which are mostly IT related.
2. They aren’t as old as some of the IITs and NITs. They were set up even after IIT Guwahati, which is the 7th IIT in terms of establishment year.
3. They don’t possess big campuses and a vast infrastructure.

But those who belong to the field of engineering (especially IT), give high ratings to these institutions, especially IIIT Hyderabad. These three offer research oriented academics. They even offer UG research programs. 

IIIT Hyderabad, Delhi and Allahabad are performing really well in their respective fields. They should be given much more attention.

Here are a few pros and cons of the institute that will help you understand this matter better

Pros

• NSIT offers an excellent ROI considering its minimal fees and excellent scholarships, internship stipends, and placement opportunities. 
• The academic workload is very low and studying a month prior is more than enough to ace the exams here. This helps you save time for MOOCs and build up your CV.
• The quality of companies that visit for placement is top-notch. The institute welcomes diverse recruiters from silicon valley startups to very established big MNCs. 
• NSIT Delhi has some of the most talented people taking admission here. The 1% of people in AIEEE or JEE-MAINS get to study here. An excellent peer culture helps you gain extra knowledge of life.
• NSIT has a very rich coding culture and has produced some of the best coders. Online coding is common here and people can be seen involved in Codechef, SPOJ, Codeforces, and TopCoder.

Cons

• The syllabus is outdated, obsolete, and fails to meet industry trends.
• The faculty is pretty demotivated and has no interest in teaching. You will have to resort to self-study most of the time and seek help from your seniors.
• Being a government college, getting some administrative work done is a big task. The results are often full of errors and approaching the administration and getting your query solved is difficult.
• The research culture is pathetic here and the faculty do nothing to promote it among students. In fact, it’s difficult to even approach them for a project.

Overall, the institute offers a plethora of opportunities, especially in the IT sector but the quality of academics is a bit on the average side. As for your question, the yearly compensation is not 1 crore but much less. The figures are misleading and pay us just like what Google would pay in India around INR 24-25 LPA.

Although IIIT Delhi has a better curriculum, academic environment, and even placement scenario, the opportunities offered at NSUT Delhi are no less. The average package of IIIT Delhi 2023 placements stood at INR 23.72 LPA while the median package of NSUT Delhi is INR 16 LPA.

However, these figures do not mean much for a fresher because IT giants like Google have the same recruitment procedure for every college. Students from all colleges be it a top NIT, IIIT-D, NSUT, or a local college were given equal chances to appear for its interview. 

Surprisingly, even NSUT Delhi gets enough offers from Google so placements have nothing to do with the curriculum you have studied. NSUT students are all-round coders whereas IIIT Delhi students are proficient only in competitive coding. Even the number of students getting into IIMs is more for NSUT than IIIT Delhi. 

So, NSUT is much better than IIIT Delhi because of the crowd quality and education.

NSIT organizes an amazing cultural fest and also has many societies, clubs, and sports facilities. Overall, I will suggest freshers who are certain of pursuing a career in research in computers or communication, signal processing, etc to join IIIT Delhi but if you are uncertain about your inclination, choose NSIT Delhi. It will guide you!

Here is the answer to your query-

The first ‘I’ in IIIT Hyderabad stands for ‘International’. It is a private ICT Research University that was founded in 1998. The first ‘I’ in IIIT Delhi stands for ‘Indrasprastha’. It is a government institute and comes under the Delhi Government. The first ‘I’ of IIIT Allahabad stands for ‘Indian’. IIITA and IIIT Pune come under the collective of institutes that are actually the IIITs, as in, the Indian Institutes of Information Technology.

IIIT Allahabad is one of the 5 IIITs that were formed by MoE, and it has the tag ‘Institute of National Importance’. IIIT Pune is among the other 20 IIITs that were formed under the PPP (Public Private Partnership) model. It is also an Institute of National Importance.

IIIT Hyderabad is one of the best in India for CS. The CS department of IIITH boasts of top-notch placements, a good number of entrants into GSoC, and high participation rates in Competitive Programming. 

Only IIIT Allahabad and IIIT Pune belong to the collective of Indian Institutes of Information Technology. The other institutions mentioned by you are different from this group.

I have friends in both the colleges DTU and IIIT Delhi so I can give you a comparative analysis of these colleges

• IIIT Delhi charges almost double the fees of DTU, so if you have financial constraints, DTU is a better choice.
• IIIT Delhi has a rigorous campus life and heavy workload sparing no time for extracurricular activities. 
• DTU students score better CG even though they are involved in many nonacademic activities. A high CG score is crucial for MS or further studies and even more so during placements.
• IIIT Delhi has a smaller batch size so it's easier to become part of any cultural competition because of quantitatively fewer people competing for the same.
• DTU has a bigger campus and better infrastructure than IIIT Delhi which operates from a tiny campus.
• Except for core electronics, you can almost pursue any career as a DTU student because of the free time you have. The mechanical societies of DTU are excellent.

The choice between the two is a matter of personal goals and inclinations. 

All three colleges namely, IIIT Delhi, NSIT, and DTU are excellent options for CSE. However, you might want to consider the following points before making the final decision 

• Campus life: In terms of campus life, the DTU is the best option followed by NSUT and IIIT Delhi. DTU offers a very laid-back cap pledge life experience with a minimal workload and a lot of time to pursue your hobbies. There aren’t many restrictions on attendance also.
• Curriculum: IIIT Delhi is a clear winner in terms of curriculum as it has no extra subjects in the first year. Students are taught coding languages and related assignments from day one and thus prepare students better than their counterparts.
• Research: IIIT Delhi is a research-oriented institute and has better research facilities, labs, and resources. DTU and NSUT have a similar research culture. 
• Infrastructure: IIIT Delhi is a newly established college so has modern infrastructure, although the campus is small. DTU and NSUT have larger campuses and better sports facilities.
• Fees: IIIT Delhi charges extremely high fees around INR 4.62 Lakhs (1st Year Fees) which is almost double the fees charged by DTU INR 2.19 Lakhs (1st Year Fees)

So choose wisely based on your priorities!