These both branches are good but aerospace don't have that so demand In India because as our aerospace engineers are from the other countries only but there is a lot of scope in mechanical engineering since India is a hub of manufacturing unit in the world so we have a great demand for mechanical engineer , when we compare to other countries , only India has great scope in it , as R&D is not present in India , definitely in future there is a good scope in mechanical engineering , but while comparing the other factors like syllabus , the syllabus is quite difficult and very vast for aerospace engineering so only few people get passed out so only few colleges have this branch but for mechanical it is completely different we only have less syllabus and less topics and it is also very easy to get passed out and as there is also a great scope in it in India so we should also find other reasons as we should also send your interest too and go in your way as when you are passionate in any thing no one or no factors can stop you