See both of the universities you have mentioned are one of the best institutions in India. So you can choose any of it as it will not make a huge difference. Although from a research and placement point of view, IIIT Bangalore is a bit better than IIIT Delhi. If you see the qualification and the updated profile of the faculty members then you will find in IIIT Bangalore there are professors more active in research. In case of placements the average packages is a bit better. Now its you choice, there isn't a huge difference between this two and frankly speaking every year the stats change, so choose which ever college you prefer.

To know more about IIIT Delhi visit the link below:

https://www.careers360.com/university/indraprastha-institute-of-information-technology-delhi

To know more about IIIT Bangalore visit the link below:

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

I hope this answer helps. All the very best for your future endeavors!