You didn’t mention your branch, which makes it difficult to draw a conclusive comparison. NITIE is known for its Industrial Engineering course.
If you are talking about Industrial Engineering is definitely the better option as compared to IITs. It offers great placement opportunities for Industrial Engineering students. The average CTC offered at the institute is around 20 LPA. In 2021, the highest CTC offered was 44 LPA. Such salary packages are unheard of for M.Tech courses at IITs.
If you are talking about branches other than Industrial Engineering then you should first figure out which branch interests you more, before choosing an institute.