Students from both these institutes will have a bias for their respective colleges. If you ask IIIT Bangalore students, they will recommend you choose their college. The same is the case for NIT Calicut students.

Reach out to one senior from both these colleges who belongs to the CSE department. Ask them about the infrastructure, faculty, curriculum, placements, and other important aspects of their respective department. Don’t ask an NITC student about IIITB, and vice versa. This is because they might have misconceptions about the other institute. 

I would recommend IIIT Bangalore. The institute has top-notch faculty, placements, research facilities, campus quality, and hostels. Moreover, it doesn’t follow any reservation criteria for admissions, unlike NITC. 

Try to approach seniors from both these colleges, and research a bit on the IIIT Bangalore CSE department. Also, IIIT Bangalore offers iM.Tech in CSE, and not B.Tech.

Based on my research, I will present some points to support the opinion that I will put by the end of my answer-

• Faculty- The faculty of IIIT Delhi is considered to be one of the best in India. The college offers top-quality classroom teaching. But even IIITB has good professors. 

• Curriculum- IIITD offers the most relevant and flexible curriculum for B.Tech CSE. They will teach you core CS from the first year itself. Even IIITB teaches core CS from the first year, but it started with iM.Tech quite recently, in 2017. IIITB doesn’t offer B.Tech courses. 

• Funding and perks- As IIIT Delhi is a state government-run institute, it gets funding and other perks.

• Infrastructure and Internet facilities- Being a new institute, IIIT Delhi has better infrastructure and Internet facilities. 

IIIT Bangalore is a better choice for an M.Tech CS, based on curriculum, placements, etc. But as far as UG studies are concerned, B.Tech CS at IIIT Delhi is better than iM.Tech CS at IIIT Bangalore.

IIIT Bangalore and IIIT Hyderabad are top institutions.

IIIT Hyderabad competes with the top IITs. The coding culture over there is top notch and the competitive spirit among peers makes you work very hard. The faculty is hardworking and inspires students to become good professionals. Students are encouraged to create their own successful startups like SETU,Crypsis, Synovel etc. IIIT H intakes students purely on merit basis, there is no provision of reservation during admissions.

Sir P.J. Narayanan, the professor and current Director of IIIT Hyderabad is known for his work in Computer Vision, Computer Graphics, and Parallel Computing on the GPU. You will learn a lot under his guidance.

IIIT Bangalore has a great coding culture and is known for its academics. Its students participate in the ACM-ICPC finals.

Both IIIT Hyderabad and IIIT Bangalore are really good institutions, and you should apply to both so that you get the opportunity to study in either of them.

We need to consider a number of factors before choosing one college from DTU, NSUT, IIIT Delhi, IIT Bangalore, IIIT Allahabad, and NITs. 

• Quality of education: In terms of academics, IIIT Delhi serves the best. The teachers are genuinely interested in teaching and encouraging students to research work. In DTU and NSUT students are expected to cope with the curriculum on their own.
• Campus life: DTU offers the best resources and campus life to its students followed by NSUT and IIIT Delhi
• Peer group: You will find the best peer group that is passionate about CS at IIIT Delhi and NSUT. 
• Placements: This aspect is quite arguable because there is the general scenario as well as the statistics to consider. Generally, DTU fares better than NSUT and IIIT Delhi but if you look at the statistics, IIIT Delhi is the best among these colleges followed by NSUT and DTU. 
• Brand Name and Alumni: In this aspect, DTU is the clear winner. 
• Research Culture : IIIT Delhi has more faculty that are inclined towards research. The overall ambiance is conducive to cutting-edge research and students have to do research as a part of the curriculum. IIIT Delhi is followed by NSUT and DTU. 
• Higher Studies: IIIT Delhi has a CGPA system while NSUT and DTU have a percentage system. A CGPA of 8.75-9 is considered pretty good while even a percentage of 79% is not. So IIIT Delhi students face a certain advantage during shortlisting. Additionally, their research work and skills add to their overall profile and increase their chances of admission to top universities.

Overall, the best option for you is IIIT Delhi considering the above aspects.

No, IIIT Gwalior is in no way better than IIIT Bangalore. The latter has an upper hand in almost every aspect be it research culture, coding culture, campus life, peer group, infrastructure, faculty, and placements. IIIT Bangalore is more reputed and its degree has more value than IIIT Gwalior. Below is the statistical comparison of both the institutes to prove my statement further

So, unless you have any financial constraints, IIIT Bangalore is a much better choice than IIIT Gwalior.

NIT Surathkal B.Tech in CSE is definitely a better choice because it's one of the oldest institutes with a rich legacy. The department has lots of establishments in academics as well as industry. There are several well-established student activity bodies and an elaborate alumni base with a coding background.

I am strongly against you joining an integrated program at the bachelor's level because you first need to know the exact domain you are interested in. If you realize that you have taken the wrong branch then spending 5 years will become very difficult. BTech gives you enough time and opportunities to analyze what your interests are you can not decide, after 3-4 semesters, you will be able to judge yourself overall. Also, a B.Tech in CSE from NIT Karnataka with a good GRE score may help you get admission offers of MS abroad.

So go for NIT Surathkal BTech in CSE without any second thoughts.