Hello Aspirant,

IIIT Gwalior is much better than IIIT Jabalpur in terms of infrastructure, age,facilities, placements, recognition etc.
In spite of these the cutoff of IIIT Jabalpur is higher than Gwalior only because of the fact that Jabalpur offers four year cse while IIIT Gwalior offers 5 year IPG programme and many students opt for jabalpur just to save 1 year time, but overall I would recommend you to go for IIIT Gwalior if your interested in mechanical branch.

Hope this helps

Good Luck