Rather than giving you a direct answer, I am going to evaluate all The aforementioned institutes individually on the basis of some common parameters like placements, brand name, campus life, opportunities, and alumni.

IIT BHU ECE

• Core placements are rare and students mostly build their profile for software development companies by becoming proficient in various programming languages, doing competitive coding, doing projects, and trying to build a computer science-inclined profile. A handful of students target core engineering roles.
• The brand value is similar to other colleges mentioned
• The campus is rather old and might disappoint freshers expecting a good college life.

IIT Guwahati ECE

• Unfortunately, I have no knowledge about this Institute. However, I recommend you contact the seniors of IIT Guwahati for the same.

IIT Hyderabad Maths and Computing

• Usually, MNCs attract top-tier software and financial services firms. If you are a hardworking student, it wouldn’t be difficult to secure amazing offers at top firms.

IIIT Hyderabad CSE

• IIIT H has possibly one of the best computer science departments in the country. 
• You have to do core computer science courses right from the first year.
• Many students get selected for Google Summer of Code and IIIT Hyderabad has its alumni in top-notch firms. 
• Being highly academically oriented, IIIT Hyderabad has minimal campus life and extracurricular activities.

Ultimately, it’s a matter of preferences and what you are looking for in your degree.

For a safe and secure future, a good salary package and an easier job, I would suggest you choose Fire and Safety Engineering at SOE, CUSAT. On the other hand, if you are confident about your programming skills and knowledge, wish for a career in IT, and would be satisfied with a comparatively lower salary (probably), choose the CSE course at SOE, CUSAT. In Safety, the job profiles are less demanding and the competition is not as high as in CSE. CSE jobs are purely merit-based. To get into Amazon, Snapdeal, etc. with high packages of 11–14 LPA and above, you need to be very skilled and hardworking. Curriculum-wise, Safety is a lot easier and contains the basics of the branches- CE, ME, EEE & EC. Therefore, based on your personal preferences, choose your stream wisely. Both CSE and Safety at SOE, CUSAT are good courses.

You need to consider several factors before deciding the best college for yourself. Here are a few factors and the preferred choice if you give preference to that factor alone

1. Alumni : The age of the institute determines how strong the alumni network is which is very crucial for the development of the institute. In terms of the alumni network the preference order should be NIT Jaipur=NIT Kurukshetra> NIT Delhi
2. Placements: The placement scenario is somewhat similar in all the aforementioned institutes. However, NIT Delhi has a slight advantage being in Delhi. The order should be NIT Delhi > NIT Jaipur = NIT Kurukshetra
3. Faculty: In my opinion, NIT Delhi has the best professors.
4. Campus : NIT Kurukshetra and NIT Jaipur have equally beautiful campuses whereas the permanent campus of NIT Delhi is under construction.

Ultimately, the final decision depends on your personal preferences.

As a student of UIET CSE, I will share some merits and demerits of the same with you-

Merits-

1. If you are a good coder, UIET offers decent placement opportunities in the CSE branch.
2. There is a 24*7 library facility.
3. You’ll get the ‘Panjab University’ tag. 
4. It is located in Chandigarh which is a serene, beautiful, and well-planned city.
5. Your personality and leadership qualities will improve.

Demerits-

1. The teaching environment isn’t good. You’ll have to learn by yourself, regardless of branch.
2. The tag of ‘IITs’ or ‘NITs’ holds much more significance.
3. You might not get the desired placement. In that case, you’ll be sitting for some competitive exam. For a placement in 4.5-5 LPA slab, you’ll have to work hard.

NIT Patna IT is a good option because it offers good placements and an NIT tag. As far as IIIT Bhubaneswar CSE is concerned, you can check all the information related to it and compare it with the other two.

Both IIIT Allahabad and MNNIT are highly regarded engineering colleges in North India offering premium quality education. Placements-wide, MNNIT CSE is slightly better compared to both NSUT and IIITA. In my opinion, the preference order should be

MNNIT CSE >= IIITA IT > NSUT CS/AI

MNNIT is the first choice because it’s on Eid the top 5 NITs with the most sought-after branch CSE. IIIT Allahabad is also a great choice for CSE because it has a CS-tailored curriculum and ambiance. 

Overall I feel if you are certain of joining an IT company, and have an interest in coding and computers go for IIIT Allahabad IT or MNNIT Allahabad. If you are unsure of your branch preference go for NSUT.