First of All, let me Correct you. It's COE as in Computer Engg in NSIT
Considering the fact that You haven't mentioned your interests, I'm assuming You have equal Inclination in both the fields!!
For Branches like COE/IT or even ECE You should prefer NSIT over DTU..
For Core Branches like Mechanical, DTU would be a Better Option!

PS : Comp. Engg is the most Coveted branch of Any College; if you don't have interest in Electronics, go for COE at NSIT!