Here is the best preference order you can refer to while choosing one IIIT from the long list you mentioned. I have considered all parameters including placements, coding culture, research, infrastructure, alumni, etc
If you are genuinely interested in coding or CSE, the best options for you would be IIIT Hyderabad, Allahabad, Bangalore, and Delhi. You can consider the top NITs as excellent options too. These 4 IIITs are the only IIITs that are better than NITs in terms of research, curriculum, and holistic development.
IIIT Lucknow, although a new IIIT, has established its name among the top IIITs. Its high ranking is because of its excellent coding culture and thus many product companies visit it. These 4 IIITs have their own campus too and charge high fees because of the top-notch faculty and research resources they offer.
All the remaining IIITs are in the development stage and should not be given consideration. It’s better to choose the top 7 or 8 NITs than these developing IIITs.