Okay, I guess time to go back to the basics
Tell us, what makes you think that you have a better future as a Mechatronics Engineer than as an Aeronautical Engineer? Probably, you have found out; or just heard a friend commenting that a degree in mechatronics engineering will earn you a high paying job.
Both fields are entirely different. In my opinion, since you have ample time to decide which career to choose; you should let some time pass by. Keep an eye on developments in both the fields you'll know what's for you in both of the fields.
But in the end, choose the one that gives you more satisfaction. If you do what you love to do, money will follow.
Probably, you were not looking for such an advice
. In my opinion, its too early to decide.