We can't pick a direction for you.
I'm assuming you're still in high school and trying to figure out a direction for university studies. (Also assuming you're in North America.) If so, remember that you don't necessarily have to make this specific decision right away. It's better to stay general for longer and get specific as you go. So right now, your biggest decision is probably more along the lines of whether to study physics (from which you could branch off into astrophysics when it's time to go to graduate school) or engineering, where you would specialize in aerospace in your second or third year of undergraduate studies. And in most cases the first year of physics or engineering programs are reasonably equivalent, so if you go in one direction, but decide you'd prefer the other, it's often possible to switch.