I'd say it really depends on what interests you more. Both the Aeronautical and Automotive industries have massive opportunities and seemingly will continue to have in the future. From what I know, if you want to work in core Aero then the Aerospace industry definitely has more scope than Automotive since 'regular' car makers don't usually put that much resources into Aero. If you'd b rather be doing something like Control Systems, Mechanical Design, Structures etc both the industries will have plenty of openings for you to get into