Hello,

Considering 2020 rankings for Engineering colleges, IIIT Lucknow is not ranked. And talking about IIIT Gwalior and NIT Kurukshetra.

1. NIT Kurukshtra is ranked 40
2. IIITM Gwalior is ranked 100

There are many factors which are considered during the ranking, but since you are getting  CSE/IT in IIITM Gwalior which are the 2 most preferred branches, then its your choice, go through the subjects of all 3 branches, and decide whether you want to go with the "NIT" tag or with CSE/IT branch.