Dear Aspirant,

IIST is the best option any day if you are aiming for aerospace engineering. It is undoubtedly one of the best institute for students aiming for any space related engineering. The focus of IITs and NITs is more on job and less on research and feeding curiosity in the students.

If you ever have a choice, then go for IIST if your aim is aerospace. However, if you shift to core branches then go for IITs as they are good in that.

Hope this helps. Thank you.