If you had specified the parameters on which you are judging the institute, it would have been easier to answer the question. In terms of quality of education, the two IIITs are better than the three NITs. 

Given below is a brief comparison of the institutes based on various parameters. You can make your decision based on that. 

Faculty:(IIIT Delhi > Top NITs ~ IIIT Allahabad)

IIIT Delhi has the best faculty. Even top NITs don’t come close to IIIT Delhi in terms of faculty. 

Campus Life: (Top 3 NITs > IIIT Allahabad > IIIT Delhi)

The top 3 NITs offer better campus life. As compared to NITs the workload of IIIT Delhi is too much. IIIT Delhi also does not have as many clubs and societies as top NITs. NIT campuses are also bigger in comparison. 

Hostels: (Winning Institute - IIIT Delhi)

• IIIT Delhi has better hostel facilities as compared to any other Govt. college or even some IITs for that matter. In summer you will get air conditioning and a heater in winter at IIIT Delhi. There are also sports facilities like Foosball and Swimming Pool, etc. 
• Other facilities available at IIIT Delhi are quite similar to that of NITs and IIIT Allahabad.

Placements: (IIIT Delhi ~ Top NITs ~ IIIT Allahabad)

In terms of placements, IIIT Delhi matches the placement statistics of top NITs. A student of IIIT Delhi has recently secured a placement package of 1.45 Crore. The average package of the institute mentioned in the question is around 15-17 lakhs (for CSE). 

Location: (IIIT Delhi > Top 3 NITs ~ IIIT Allahabad)

• IIIT Delhi enjoys the benefit of being situated in the capital. The city life, start-up culture, and many internship opportunities are some of the perks of attending IIIT Delhi. 
• Whereas, the top 3 NITs are situated in small cities. IIIT Allahabad is also located in Prayagraj, which does not offer a good city life or enough exposure. 

But whether you will like the campus or not depends on your background. If you are from South India, life in Delhi or Prayagraj may not be that appealing and vice versa. 

Reputation & Alumni Base: (Top 3 NITs > IIIT Delhi > IIIT Allahabad) 

• The top NITs have more recognition among the recruiting companies due to their legacy. IIIT Delhi is a fairly new establishment in comparison. Even though it is growing at a rapid pace, it is still up to the standard of the top NITs. 
• The alumni base of the top 3 NITs is also better due to the same reason. 

If you are genuinely interested in coding, you should choose IIIT Delhi or IIIT Allahabad. Otherwise don’t go for IIITs.

One of my friends is a student of IIIT Delhi and he has visited IIIT Allahabad on a few occasions. Here is his insight about both the institute. 

IIIT Allahabad: 

IIIT Allahabad has witnessed a severe leadership change in the last few years. It had difficulties in retaining their faculties. A lot of students complaining about the previous Director, lack of faculty, hostels. The new Director is working to improve things, but it will require time. 

There were a lot of negative stories about the place in the media in the past, but none of them seemed to have made an impact on admission. students recruitment. The institute has always attracted top JEE rankers.

IIIT Delhi:

On the other hand, IIIT Delhi has not only attracted top faculty but ensured their retention. The environment on campus is quite good. Both students and faculty seemed to be happier compared to IIIT Allahabad. 

The table shows a brief overview of the institutions.

Overall, IIIT Delhi offers a much pleasant campus experience as compared to IIIT Allahabad. However, despite the negative publicity, IIIT Allahabad is quite reputed and attracts top JEE rankers, so, will have a great peer group. And if you genuinely want to learn, you can do that from IIIT Allahabad. 

The Alumni network is the most important factor of placement statistics and MNNIT Allahabad has one of the best alumni networks.

Delhi provides you with nightlife whereas Allahabad does not. Allahabad is not a metropolitan city like Delhi. If you want these two things, MNNIT is not for you. But it will definitely provide you with great learning opportunities. You can enjoy yourself a lot with your friends, more than you expect. Hence, it does not become less enjoyable just because it lacks nightlife and the tag of a metropolitan city.

Transportation matters a lot when it comes to placement drive. HR of reputed MNCs don’t have enough time to travel via road or train for recruitment purposes. Despite not having an airport before, MNNIT Allahabad has managed to keep its placement statistics outstanding. 

For CSE the most popular choices among students are as follows. 

1. IIIT Hyderabad
2. NIT Trichy
3. NIT Warangal
4. MNNIT Allahabad
5. IIIT Allahabad

So, CSE from MNNIT is one of the best. You can definitely consider it as a valid option. 

The answer to this question depends on how you can cope with zealous competition after joining college. If you are confident that you can join the brawl and top in your first year, I would highly recommend taking MSc in Economics at BITS Goa Pilani. 

• BITS Pilani has been ranked among top 30 institutes in NIRF Ranking 2020. 
• In your 2nd year, you can choose a B.E. course according to your first year CGPA, including the highly coveted CSE program.

• You'll have to spend one more year as compared to your B.E. colleagues.
• Getting your desired course can be a real disadvantage, seeing that there is no dearth of distractions on campus.

If you do not want to take a risk, choosing IT at NIT Surathkal is the best option for you. Since the syllabus almost corresponds to that of CSE and the infrastructure is mind-blowing at the campus.

Both the campuses BITS Goa and IIIT Delhi are of equal importance, it depends upon where you live. The academic curriculum, faculty, different clubs, internships, coding culture, and whatnot are some of the opportunities provided in both colleges. There is no problem in finding internships during the BTech program as the college provides the same.

BITS Goa has more activities than IIIT Delhi. It will help you expose to many different things and enjoy your life and studies as well. So I can say that it is your personal choice to opt for the particular campus after thinking about your desires.

Thus, we can conclude that identify your preference keeping in mind the various pros and cons of the college, along with the desires of your college life, then only opt for the particular campus, BITS Goa or IIT Delhi.

IIIT Delhi is clearly the best choice out of the three options especially if we are talking about CSE. Your preference order should be the following.

IIIT Delhi (Indraprastha) > Thapar University > LNMIIT Jaipur

Cutoff: (IIIT D > Thapar University)

The quality of the students also has an effect on how the college performs and also in its rankings. The cutoff for CSE at IIIT Delhi is around 200-225+. Thapar University admits students with JEE Mains marks more than 170 for students’ outside Punjab and 150 marks for students from Punjab. The cutoff indicates IIIT D offers a better peer group. 

Placements: 

• In terms of placements and internships, IIIT Delhi tops the list. The avg. package for the CSE branch in IIIT Delhi is around 15 lakhs per annum. 
• Overall avg package in Thapar University is around 8 lakhs per annum and for CSE Branch is around 10 lakhs per annum with a placement rate of 94 percent. 
• In LNMIIT Jaipur the avg packages are around 6 lakhs per annum. 

Thpar has a great coding culture. However, based on student crowd, placements, etc. the best option among the given choices is IIITD.