Hi! With respect to only academics, and research in aerospace, IIT Kanpur is really recommendable. IIT Kanpur has good labs labs, including a national wind tunnel facility, and a runway inside campus, with real glider and light aircraft in flight laboratory. This can be helpful for studing further abroad.

When including college life, entrepreneurship and job opportunities other than core, IIT Bombay. This order usually the preferred in general by students, IIT bombay having the lowest closing rank. So, placements wise the list is really subjective, though Bombay gets some good placements every year.

Hope this helped!