If we consider the reputation of the two colleges, then NIT Raipur is a much older one and definitely commands a higher respect in the industry than IIIT Jabalpur. Moreover, NIT Raipur invites many big-shot companies in it's placements, and being an ECE student, you'll get the same opportunities as a CSE student as most of the companies that come for CSE roles, also allow ECE students to sit for the interview.

If you go for IIIT Jabalpur, you'll get a CSE degree, but will miss out on a better college life, and the placements will be good, but you won't get much variety in placements if you decide to go for a different field or role.

So, in all, if you want a CSE degree with good placements, go for IIIT Jabalpur, while if you want a holistic life with good placements, go for NIT Raipur CSE.

Hope I have answered your question. All the best!