You can definitely try and apply for it. IIIT Delhi is also feasible for you or you could also go for NSIT Delhi / DTU / IIIT Delhi. You might end up with ECE or IT at NSIT Delhi, Software or IT at DTU, ECE or CSE at IIIT Delhi.

• Your future completely depends on the marks, your aggregate percentage/ GPA, PORs, and skills in your resume once you graduate. 
• Probably every college in India has good placements in CSE /IT/ Software Engineering but if you take a lot of interest in programming or developing apps, OS, big data, security, ML, AI, Computer vision, etc, you will definitely bag a great MS/Ph.D. admission or even a well-paid reputed job. 
• You just need to put lots and lots of effort into this and not play games with your college percentage or GPA. Try to maintain it above 75%.
• Top companies like Google and Facebook, regardless of your stream, are open to all branches. They just see your coding skills and overall repute. But many companies only allow CSE/ IT graduates to appear, some of them are strictly for CSE.

If you are not a CSE/ IT student, getting a coding job will be hard but not very challenging. Only if you take programming seriously, you will be selected in Google or Facebook which is equally tough.

You could even have a try at Hackathons, learn, practice new programming languages, web development, and basics of graphic designing along with the complete back-end work. Try to make some interesting apps, contribute to open source and you will see budding opportunities ahead of your way. Try not to play with the college percentage/ GPA because they decide which companies you can sit for.

With a rank of 6531, you can not only just grab IT at IIIT Allahabad, but also are pretty much eligible for CSE at NIT Kurukshetra, MNNIT Allahabad, EEE from NIT Nagpur as well including the rest of the NIT branches that have a lesser rank than the colleges mentioned! 

You can go for any of these courses without a speck of doubt in your mind. If such is the scene with you my friend, you can always go for IT at IIIT Allahabad. For the same question, you might find an answer with a preference order: IT in IIIT Allahabad>CS in MNNIT>CS in NIT Kurukshetra. 

All in all, do not give up your excellent choice of IT at IIIT Allahabad. Instead of pondering, simply go for it. For IT, there is no other institution better than any IIIT in India. 

For great placements, IT ranks 8th across the whole of India making it superior to NITs. Moreover, once you enter the very premises of IIIT Allahabad, you will witness how exactly the IT culture is. This will bring forth so many opportunities for you to grab. All of this would sharpen your skills in the IT culture.

IIIT Allahabad is the institute of national importance, whereas Thapar Institute of Engineering & Technology is a deemed university in Punjab. The best institute among the two for pursuing engineering is IIIT Allahabad. It is far better than Thapar. Here is a brief overview of the institutes.

• The tag of IIIT is an advantage. IIIT Allahabad is not less than old IITs as it is one among the Tier-1 colleges for engineering.
• The quality of research and reputation it has in the industry makes it a lucrative choice.
• IIIT Allahabad offers only two specializations, IT and ECE. It diverts the complete focus on these two branches.
• The faculty of the institute is skilled in teaching and has vast experience in the industry. They use the industry-specific teaching approach and prepare the students to take up real-world challenges.
• The coding culture of the institute is renowned in the country. It has given birth to many excellent programmers in the world. Every year, a team goes to compete at the international finals in ACM ICPC. Heard of ‘Humblefool’? Till date, he is considered the best programmer from India and he belongs to IIIT Allahabad.

Overall, the above points conclude that IIIT Allahabad is not only the brand, but it also gives the best return on investment.

My younger brother is doing CSE from NIT Kurukshetra. So I might be able to help you with this question.

• If you get IT here, consider yourself to have CSE. There is almost no distinction between CSE and IT in this context. Almost all the subjects studied in CSE are also covered in the IT syllabus as well.
• The syllabus is being revised, and the new syllabus will be implemented beginning with the July session. So, hopefully, you won't be forced to learn about out-of-date technology that no one uses today.
• The institute has a strong coding culture. Students engage in healthy competition. Every even semester, the seniors (who are among the best in the game) organize extra classes on Algorithms, Discrete Math, and Data Structures (through Competitive Programming). 
• In college, there are some fantastic developers. GAWDS (Graphics and Web Development Society) is a society full of super talented people who are experts in their fields and with whom you can learn and grow as a developer. 
• My brother was allowed to miss his Mid-Term Exams because he needed to attend a prestigious Competitive Programming Contest at another college. 
• For CSE and IT students, there is a technical society called Techno byte, which is heavily involved in organizing Altius and Techspardha, the latter being the largest Techno-Managerial fest in North India. 
• The seniors here are extremely cooperative.

Heres providing some basic differences between the two institutions - 

The only thing you'll miss is city life. Kurukshetra doesn't have much to offer, but you won't have time or reason to leave the campus because there's always something interesting going on.

Firstly, you should know that there is no difference in the facilities and reputation of the colleges, Although BITS ranks better as an engineering school. BITS Pilani ranks #30 on NIRF's Engineering rank list and IIIT Allahabad ranks #103 on the same. But you should focus on your monetary capacity in consonance with your future plans before applying. 

My cousin studied at IIIT A and the following points are based on his experience:

• IIIT A is an excellent place to study coding. The classes are good although the syllabus has to be maneuvered because it's tough. You can manage it through attention in the classroom.
• Attendance is an important part of the academic process here because IIIT A has a 75% mandatory attendance rule.
• Without a doubt, BITS has a higher fee range as compared to IIIT A, about 7 LPA for a 4-year program.

Here's a table comparing both institutes:

Lastly, if you love the mechanical stream and are truly motivated to study Maths and Physics then you must go for it. Mechanical is a vast field as well because you'd learn everything related to mechanical processes and even production scheduling. So clearly check your interests and goals before deciding.

VSSUT Burla is a much better option than IGIT Sarang. VSSUT, Burla - Being the Oldest engineering institute in the state, has some of the best faculty, a huge library, and a wide-spread Alumni net.

Discussed below are a few important points about VSSUT Burla.

• For any branch, VSSUT will be a better option, since it has better placement records, campus infrastructure, clubs, and the cutoff rank is also higher. 
• Most importantly it's autonomous so it has its own examinations and curriculum.
• If you have any problem regarding something you can directly get in contact with the Vice-Chancellor at VSSUT Burla. 

The table below gives a brief overview of the institutes.

One of my cousins was in the same situation, whether to choose VSSUT or IGIT, and he chose VSSUT. If you look up the statistics you will clearly see VSSUT is much better than IGIT.