Hii sir, selection between IT( information technology) from maharaja agrasen Institute or mechanical engineering from BITS hyderabad depends upon the goals and interests of your son. I can give you a description about both

1. BITS HYDERABAD: it is a top tier institution with high placement records and strong industry connection. Mechanical engineering offers good prospect in industries like manufacturing, robotics etc. Higher chances of Internship, research and networking.

2. Maharaja agrasen Institute:  it have a decent reputation but it's placement records may not match BITS hyderabad.  It gives you local opportunities so if you are looking to work in the local tech it might help.

In my opinion BITS could be a better option. But you should take decision based on other factors like distance , personal preferences, faculty etc.