See what I think about DTU students may be proven wrong. After all I myself had a blast in four years in college and enjoyed every moment of it. But of late I have seen students complaining about this and that. Regarding NIT Trichy too some students who joined in 2010 are surprised to see the relatively lower placements this year. But in all this perhaps the college is not at fault. Perhaps it is because of the fact that there is a job crunch or something else. But the gut feeling is that a college where students are better is automatically a better college. Then again, being in Delhi has advantages. Like in third year you can better internship opportunities, go to CAT coaching, IAS coaching (undoubtedly in terms of coaching classes, Delhi is sought after).
Between Warangal and Trichy it all boils down to which branch and then which place. According to you, which state are you more willing to go to?