Hello,

I suggest you to go for VNIT Nagpur as it is better than NIT Delhi in lot of areas. It also depends on the branch you are really interested in and as of competative exams you can prepare for them from anywhere and it is true that delhi has good coaching institutes regarding that matter but nagpur city is not far behind.Coming to the college alone NIT Nagpur is way better than NIT Delhi in almost every aspect like ranking by mhrd, the campus placements, fests,alumni. So I suggest you to weigh your options very carefully before taking a decision 

Good luck!