My GP told me that it is harder get into a "good" specialty in UNSW because it is very competitive, and it will be easier in QLD because everyone is more "relaxed" (I don't know what he meant by good speciality... Or what more relaxed means...)
Wouldn't put too much weight on that. When you graduate every specialty will be competitive everywhere.
The way I see it from your options, is that if you're keen to move out, why not? This is the optimal time - you'll have money to do it. If you're not keen to move out, you've got a great chance to stay at home as well. Keep in mind that you'll be working in the same state you graduate from for at least the first year out as a doctor as well.
In terms of quality of courses, probably not a huge difference. Perhaps UNSW is associated with some larger hospitals for clinical years, but that doesn't necessarily mean those are better clinical placements.
As with all big decisions, ask around broadly Let us know what you end up choosing!