Hi Shaurya! 

IIIT Lucknow because it has better coding culture and placement. It ranks higher than NIT J on codeforces.com,one of the toughest competitive coding site.Also, of you go for nitj me,  you will look here abd there for placement and your life will be ruined.CS has great scope and better job opportunities .

But if you want NIT tag then as your wish. 

Please upvote if this was helpful to you.