Which one is a better college among these: KJ SOMAIYA, BIM TRICHY and GIM? Cite appropriate reasons if possible..

There is no better college of the two because both are equally good in terms of placements and faculty. Both have their pros and cons. But here I will just cite some pros of both colleges that might help you make a better decision. 

Pros of GIM

• Offers a comprehensive learning experience 
• Many student-operated clubs and committees 
• Fun-filled campus life 
• Top-notch infrastructure
• Better placement opportunities and exposure to industry projects
• Smaller batch size therefore a better chance to grab good packages and lesser competition.

Pros of KJ Somaiya

• KJ Somaiya a location advantage for students from Mumbai, Maharashtra 
• better ROI

For more details you can talk to the alumni of the respective colleges.