The Qantas Academy does not guarantee you a path into Qantas. At best at the moment it may get you into QantasLink. Anecdotally only about 50% get onto the hold file for Qantas group. Getting into Qlink can make a transition into mainline harder (and again no guaranteed pathway).
Airforce sounds exciting but be aware you go where your told and do what your told. This may include fighting wars you don’t believe in and killing civilians and being killed yourself. You will also need to convert to civilian licences. However everyone I know who joined military loved it.
university degrees are a waste of time unless nothing to do with aviation.