Dear

Aerospace having more wider term for opportunities , placement , knowledge , further education and in research. So choose the field which give you more opportunities and growth.

All the Best

Both are different courses. Aerospace engineering deals with design, construction, and maintenance of aircraft,satellite,as well as space ship. Aerospace engineering has  very wide and deep prospect. Whereas aircraft maintenance is merely related with maintenance of aircraft. This is one of the highly paid branch. This field is glamours as well. Ame will responsible for safe flight of aircraft, without he's final approval aircraft cannot fly. So you can easily assume how responsible this very aircraft maintenance engineers job is.good luck.