Hi, since you have already got IIIT  with Electronics stream so it's ofcourse a good choice. IIIT Kanchipuram is a good college though not a overall best in it's range but it is also a leading Institution of the country. Afterall it's a central Institute so it's have it's own prestige. So overall you should go with this IIIT, Kanchipuram without any doubt.

Good Luck.