compared to mechanical and aeronatical which has more scope?
Aeronautical is a specialized course. If you choose Aeronautical, then you have to study hard. There are few companies in India which will hire you so you have to study accordingly keeping these factors in mind so that you remain above most of the students in your branch. On the other hand, if your do mechanical engineering from a good college, then there are huge chances of getting a government job if you do well in GATE exam. You may also study M.Tech and further specialize in your domain.
Good Luck!!