International Institute of Information Technology, Hyderabad

Difference is of the level only. IIIT, Hyderabad has a very high level in comparison of IIIT Delhi. Placements of IIIT Hyderabad are the best in India.

There's not much of the difference. Go for it.

It's sound good to compare IIIT-H with the IITs, NITs. People generally prefer IIIT-H over lower and new IITs and the NITs.
The only factor on which I can compare VIT and IIIT-H is the fees. Both the college have the fees around Rs 2 lakhs/annum.
For the rest of factors, there is no comparison.
P.S. Don't go blindly with the rank if you have seen published by some local survey.

Hi,
Check out link below for detailed information about undergraduate admissions at IIIT, Hyderabad:
https://www.iiit.ac.in/admissions/undergraduate/

Please use the link provided below for details regarding fee structure of IIIT-H for a Ph.D course in CSE. You should be able to download their brochure which contains accurate details like application dates, eligibility criteria, fee structure, etc.
https://www.shiksha.com/engineering/course/phd-in-computer-science-engineering-cse-international-institute-of-information-technology-iiit-h-gachibowli-hyderabad-201485

You need to have minimum 75% in 12th or you need to be in the top 20 percentile for your state board to be eligible for JEE Mains, selection in IIIT Hyderabad is purely on your JEE Mains score.