Incase youre planning a Research Internship or Project, I would suggest you to pursue MNNIT Allahabad over MNIT Jaipur. MNNIT has much better research facilities, faculty and self & Industry funded projects going on under its belt. The Academic and Research Outlook as well as the Citation Produced by Researchers at MNNIT are some of the Highest among NITs. However, again like its up to you and your vibes towards the Project. If a Professor/ Research Group working at MNIT is more inclined towards your research interests, you may definitely prefer MNIT over MNNIT, ultimately its you who are going to have the experience.