Hello atharva,
According to the sources and me,, IIT Bombay is best one.
There are no comparison between IIT.
You can check this list of aerospace engineering
IIT Bombay.
IIT Madras.
IIT Karagpur.
IIT Kanpur.
IIST Tiruvanatapuram.
Madras Institute of Technology,
Chennai.
Hindustan Institute of Engineering Technology, Chennai.
For more detail, click then link and read full article
https://engineering.careers360.com/colleges/list-of-aerospace-engineering-colleges-in-india
Hope this is helful for you.
Thank you.