My brother is from LNMIIT so I can tell you why LNMIIT is a better choice.
Ranking and Accreditation:
LNMIIT holds 2nd rank among the best IT colleges in Jaipur and 3rd best private college in Rajasthan. LNMIIT is approved by AICTE and has also been accredited by NAAC with a grade 'A'.
Alumni Network:
IIIT Kota is a recent IIIT and yet to establish a strong alumni database. Whereas, LNMIIT has a very strong Alumni base, including some notable personalities like Hemant Purohit (Assistant Professor at Information Sciences and Technology at George Mason University, Washington DC), Sanjay Goyal (Senior Engineer at InterDigital Labs, Tandon School of Engineering at Brooklyn, USA), Radhika Loomba (Research Scientist at Intel Labs Europe) and so on.
The video comprises an honest review of LMNIT
These are some of the perks of attending LNMIIT. Now, you can compare the institute with IIIT Kota and decide.