CET vs IIT Kottayam

Hi all, I would like to know when comparing CET and IIIT Kottayam which one is better. I've got a keam rank within 500, so I hope I could get CS in Cet and also through csab I might get get IIIT Kottayam also. So if I can get into both of em which one should I choose. I know academically IIIT is bet