Good universities offer top faculty, curriculum, research opportunities, projects, hands-on and connections. Extracurricular facilities always come second.
The academic facilities at IIIT Delhi are far better. It offers a far better infrastructure too. DTU has a legacy of its own. But unfortunately, it has done nothing to improve its classrooms, labs, library, and hostels. Getting a hostel at DTU is difficult, and its hostel facilities are not even comparable to those of IIITD. The campus of DTU is definitely much bigger.
Campus life at IIITD is weaker because it is a new institute with a much smaller student population. However, it provides clubs, events, and fests like any other college. You’ll get all the sports facilities at IIITD.
If you wish for better academics and research opportunities, choose IIITD without hesitation.