in both iiit Kanchepuram and institute of technology research and management Ahmedabad which is better
You should go fo IIITDM as it has overall good ratings and placements.
You can also compare both the colleges from the given below link
Institute of Research and Management Ratings ad Reviews
Good Luck!!
For further detailed information, you can go through the below links -
Indian Institute of Information Technology, Design and Manufacturing, Kancheepuram
Institute of Infrastructure, Technology, Research and Management, Ahmedabad
Hope this helps!!!