Look, brother regarding IIIT, I would say to join them only if you have interest in soft skills like coding, machine learning, CSE development etc.

So borther, join only when you have ineterest in these above skills and yes they provide a better peer group regarding the above domain.

(This statement olds true only for top 4 IIIT)

Now regarding IIIT Kanchipuram, I would say not to join this institute. Because it does not have a permanent campus till now and it doe not have an esatblished Alumini base.

So, instead of that I would recommend to look for NIT's such as 

NIT Raipur

NIT Kurukshetra