Mechanical or electrical given your choices. Choosing between these two depends on whether you want to work with wires/circuits/microchips or larger/various materials.

Aerospace may be going down for now, but don’t count a field like this out. Our aircraft will only get more and more advanced. You remember the Blackhawk of the 1960s? There are planes out there that the public isn’t aware of for security reasons. When they do go mainstream, I don’t see roads being as widely used for one day there will be aircraft for the working class consumer. It only makes sense that our transportation advances this way.

Go for what YOU want. If you’re good enough and dedicated enough, you’ll be alright. Trust me. Besides, aerospace engineers have a formidable knowledge of engineering in general. Don’t work and be miserable. Make a career something that you never a work a day in your life for, or you’ll always ask “What if?”.

better mechanical or electrical for army and navr respectively

choose your first choice