Both the colleges are almost equal as according to Careers360 analysis,Institute of Engineering and Technology, Lucknow and Madan Mohan Malaviya University of Technology, Gorakhpur both have got AAA+ which says these are the good colleges to pursue B.Tech program overall Cut-offs of national / state level Entrance exams, Accreditation and Reward status, Publication record from Elsevier’s indexing database - Scopus but there are many better options are also available so in case you get a chance to get seat there then you are advised to make IET & MMU a secondary option and before you make any decision dont forget to consider your interested branch,eligibility, convenience.

For reference, you can go through the below links -

https://engineering.careers360.com/colleges/institute-of-engineering-and-technology-lucknow

https://engineering.careers360.com/colleges/madan-mohan-malaviya-university-of-technology-gorakhpur

Good Luck!!!