what is the scope of aerospace engineering when compared to other branches of engineering?

Aerospace as of now is a promising branch with heavy reseach going on this fields.

all engg. branches are very interesting in nature

In India if u want to do Aerospace either go for IITs or some of colleges in  
School Of Aviation Science And Technology
Nehru College Of Aeronautics & Applied Science
National Institute Of Aeronautical Engineering
Madras Institute Of Technology
Institute Of Aviation TechnologyIndian Institute Of Aeronautics

There are several aerospace companies where the successful aerospace engineers and scientists can be employed.

HAl, NAL, DRDO and some private firms like AIRBUS recruit aerospace engineers

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regards

Ramesh