IIIT Kota is very new and is yet to make a mark with respect to IIIT Jabalpur. Whereas, with IIIT-Jabalpur the placements do keep varying. More or less, the placements are improving.
Academics:
So, to put it together, the academics are nice, but placements can be improved. Being from IIIT gives you a special charm. Also, being new IIITs, they will take some time to establish themselves and the education factor is quite decent when compared to tier-2 private engineering colleges. But, they still have a long way to go reach the bar set by NITs or IITs.
The top bracket companies pay really well, but these new IIITs won't be the first choice for these companies. The mid-range paying companies will flock to these new IIITs; so, you will get a decent package.
So overall, it is better to have something than nothing.