Why is IIT Kanpur CS preferred over IIT Kharagpur and IIT Madras?

Firstly, let me make it clear that Kanpur, Delhi, and Mumbai are preferred over IIT Kharagpur and IIT Madras for almost every branch. The main reasons are as follows. 

Placements: The placements at IIT Kanpur are slightly better than Kharagpur.

Trend: While choosing an institute, students tend to choose an institute based on the past year’s trend. Since the campus placement record for the top 5 IITs remains the same over the past 5 years, students tend to go to these institutes. 

These are a few of the reasons why students prefer IIT Kanpur for CS over IIT KGP and IIT Madras.