I'm doing engineering at ANU and looking to major in Nuclear Systems. The benefits of doing engineering at ANU are that they don't force you to do start a discipline straight away, they give you two years of doing generic engineering courses before you specialise. It's also a good way to broaden your career since the degree as a whole has a focus on systems engineering (not that you'll be a systems engineer per se but having holistic skills you can transfer across to various disciplines gives you an edge over people who only really know about civil engineering or electrical engineering stuff). At the end of the day, engineers from all their various disciplines will end up working together and collaborating on projects, so being able to shift your skillset with looking at designs as a whole will set you up for stuff like project management and also help with obtaining leadership positions in companies, if that's what you want.
Although whilst the engineering faculties aren't bad, some of the teaching staff aren't that great. They also have low tutoring budgets for several courses, meaning you get a lot of tutors who know their stuff but don't actually know how to communicate information to people in a meaningful way. Plus some of their lab equipment is outdated, and you may find the systems design theory work a bit repetitive and boring. I'm only sticking around for the Nuclear program since it's the only undergrad thing like it in the country, and I also largely decided on coming here because of its flexibility without being aware of some of its other flaws. I got an offer to USYD but realised I didn't actually know what tf I wanted to do so I went to ANU instead. I'm personally glad I did because if I was in USYD and heard about the Nuclear program I'd be kicking myself over not going to ANU.
So those are my two cents on it, you can take the advice if you like. I reckon if you're absolutely certain on doing Aerospace and don't have any doubts on what you want to do like I did, then go for USYD. The important thing though is to do what's right for you, so hopefully you find my perspective helpful.