According to 2018 cutoffs, the closing rank for Mechanical engineering at IIITDM Jabalpur was 35381 in year 2018. The closing rank for Mechanical engineering at NIT Agartala in year 2018 was 30783. Choosing one of them is your choice. NIT Agartala is older and well established than as compared to IIITDM Jabalpur and NIT Agartala is ranked 15th among 31 NITs in India. It has a good placement record too. IIITDM Jabalpur is also a good option to be considered in terms of infrastructure and placements.
I hope it helps. For any further queries, ask me in the comments.

NIT Agartala

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IIIT Bhubaneswar

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