Hii Vani!

All the three are the prestigious and excellent Colleges. VIT Vellore is a private deemed college having good infrastructure, providing courses such as b.tech, m.tech, BSc, etc., The fee ranges upto 8 lakhs depending on the course you choose. Its a NAAC A credited college.

https://www.careers360.com/university/vellore-institute-of-technology-vellore/courses

IIIT Hyderabad is also a NAAC A credited deemed college providing courses such as b.tech, MS, PhD etc., The college has all the necessary infrastructure, fees ranging upto 14 lakhs.

https://www.careers360.com/university/international-institute-of-information-technology-hyderabad/courses

IIIT Banglore has similarities with IIIT Hyderabad.

https://www.careers360.com/university/international-institute-of-information-technology-bangalore/amp

It depends on you what you feel like choosing and are comfortable with.

Hope this helps.

Good luck!