For ECE, IIIT Allahabad is definitely the better alternative. The list beneath elaborates on why you should opt for IIIT, Allahabad. 

Course Structure: During your 4 years of constant time at IIIT Allahabad, it will entirely be devoted to coding sessions, while at NIT, the professors are seen to teach subjects like chemistry, mechanics, engineering drawing, and several others mostly in the first year.

Coding culture: The coding culture of IIIT is famously known to be very ingenious and accomplished. Especially, the IT department can certainly be held in comparison to CSE of IITs. It has clearly been possible because of ardent students and few active professors in the stream of robotics, programming, and more. 

Infrastructure: Since IIIT Allahabad is recently built, it has well-equipped labs as well as furnished hostels. There also are buildings such as the auditorium which definitely is worth seeing. Alongside technical, the social fest is additionally excellent on the campus. You will learn just as you take part.

Placement: The average package of IIIT, Allahabad is better than several other NITs. The average package is seen to range anything between 16 - 17 lakhs.

Furthermore, there is no additional factor concerning quota here. Thus, you are expected to find students from all over India and various inventive talents. However, the decision of opting is yet up to you.

First of all, forget about SGSITS Indore as it stands nowhere in front of IIIT and MANIT. If you are looking for good placement and salary then forget MANIT Civil too. The only options you are now left with are - IIIT Allahabad dual and IIIT Amethi IT. Clearing things about IIIT Amethi, it has been closed and have been moved to IIIT Allahabad.

The table shows a brief overview of the institutions:

There is no point in spending extra two years pursuing M.Tech at IIIT Allahabad because if you are interested in a PG Degree then you can prepare for GATE during UG. Doing so will get you admission at any IITs which would be better for your career.

It is better to go for IIIT Allahabad and if you feel to go for PG then prepare, get a good score and go for IITs. Otherwise, you can always go for placements and will probably land up a very good job.

Among the institutes mentioned, IIIT Allahabad is a better alternative for Bioinformatics. One of my friends was also going through this same situation a few years back and he chose IIIT Allahabad. His experience at the institute has been quite good over the past 4 years. 

The table shows a brief overview of the institutions.

Highlights: 

• IIIT Allahabad is a premier institute renowned for its IT branch. 
• Every year around 85% of students get settled with their dream jobs. 
• BI students also go for IT companies and get placed respectively. 
• Core Bioinformatics companies don't visit the campus usually, but product-based companies like Amazon, Directi, etc offer handsome packages. 

Overall, IIIT Allahabad is the potential choice as the faculty and infrastructure are good and all the previous year’s students have been placed with good packages. 

If you are confused between IIT Mandi or NIT Bhopal, choose IIT as the primary option. 

Being an IITian has its own advantages. You will receive more reward and respect from society. One of my relatives from Biotech is pursuing his Ph.D. from Heidelberg Germany Berlin at the age of just 26. He visited almost 21 countries already for academic purposes. He also attended many Ivy league colleges like MIT, Harvard, Princeton, Stanford for conferences. 

IIT Mandi is very good at academics. The faculty here are very experienced and friendly in nature. They teach the concepts in a very easy and simple manner. 

Also, if you want to pursue higher studies, then choosing IIT will be better.

All the mentioned NITs are among the top engineering institutes in the country. Out of all the NITs in India, the best choice is NIT Rourkela. As some of my friends studied there I might be able to give you some reasons. These are:

• NIT Rourkela is famous for its Chemical Branch. 
• The research culture of the institute is outstanding.
• The institute has been ranked 16th in the NIRF Ranking for Engineering 2020. It is way above all the three institutes mentioned.
• The JEE Main cut-offs are high. So, only the best students get a chance for admission. 
• The college also encourages diversity.

The fee and chemical branch placement details are as follows.

The top recruiters include L&T, Reliance, Tata, P&G, Parle, ACC Cement, Aditya Birla, IOCL, PGCIL, NTPC, GMR Energy, GlaxoSmithKline, and more.

Overall, NIT Rourkela is an excellent choice. After CSE and EC branches, the Chemical branch recorded the highest placements. The return on investment of college is decent. But you should opt for it only if you can deal with and function under strict regulations and laws.

IIT Tag is far more acceptable than NIT. We generally say that NIT and IITs are similar but in reality, it’s exactly the opposite. The first preference is given to IIT and then it is followed by NIT. If you really want to go for a brand then opt for IIT Dhanbad and if not and really want to be a core programmer opt for IIIT Allahabad.

Let’s take a look IIIT Allahabad (IT) and NIT Bhopal (CSE) as they are almost similar. But besides placements there are some other factors, which one should consider and are as follows:

• Infrastructure: When you will compare the infrastructure of these two colleges, IIIT Allahabad has better infrastructures and facilities in all aspects.
• Alumni base: Considering the fact that NIT Bhopal is a 40-50 years old college, it has a strong alumni base. While IIIT-A started in 1999 and is growing exponentially.
• Placements in NIT Bhopal total number of students of (CSE+IT) is 300 and last year 100 companies visited there in campus placement, but in IIIT Allahabad total students (IT) are 270, and 98 companies visited here during campus placements.

According to the above statistics, this should be your choice of preference - IIIT Allahabad (IT)>ISM Dhanbad (CSE) >NIT Bhopal (CSE)

Also, if you are opting for higher studies, then Dhanbad has more opportunities than in NIT Bhopal. Labs and infrastructure are better as compared to NIT Bhopal but Dhanbad has an open campus and anyone can enter there. Considering all these factors, the choice should be - Dhanbad CSE > NIT Bhopal CSE. Also, you just can't neglect an IIT tag yourself.

A 4-year CSE from IIITDM Jabalpur will be better than that of IIIT Gwalior. It is a fairly new branch at the institute and students of this branch compete with 5-year IPG steam students which are the main ruler of the institute. 

A brief comparison of the courses mentioned in the question is given below. 

If you only consider placement, Electrical at MANIT Bhopal is not comparable to CSE at IIITs. So, it will be better if you choose a 4-year CSE of IIITDM or a 5-year IPG at IIIT Gwalior.

Both NIT Bhopal and PEC Chandigarh are very good for CSE and provide many facilities to its students. Out of both of them, I would recommend you to choose NIT Bhopal over PEC Chandigarh due to the following reasons.

• Placements are much better at NIT Bhopal. The average package being offered is around 12.51 LPA which is comparatively better than the packages offered to PEC Chandigarh students. 
• CSE department witnessed 100% placement offers at NIT Bhopal.
• While studying at an NIT, you get the 'NITian' tag which is very valuable and a matter of pride for every student out there. 
• As a city, Bhopal is more beautiful than Chandigarh.
• You can enjoy your 4 years of B.Tech at NIT Bhopal while pursuing your graduation. As there is not much load of studies and assignments on students. 

Hence, NIT Bhopal is a better institute than PEC Chandigarh and provides all the facilities and the proper environment to students without much load of studies. So, it is better to choose NIT Bhopal over PEC Chandigarh.