I had the same choice in front of me a few years back. As a student of DTU, I can present before you some pros of choosing it over IIIT Delhi for CSE. These are-
However, the CSE curriculum at IIIT Delhi is more up-to-date. Also, as DTU has a huge number of students for CSE, the competition is high.
Despite these cons, I believe DTU CSE is a better choice. But your decision should be based on your personal preferences.