I am currently doing a Post grad diploma in Australia at University of Melbourne, so I'd be biased to the Australian way of teaching. Curtin has a good reputation and there is quite a bit of research being done there, and that usually helps in how current the teaching is.
However, there are more things that you should look at when applying as you are just going to have two years of PT training, unlike the rest of us who have 4 years and more of undergraduate training. Do you have an area of interest? Sometimes the school may be leaning towards an area of research and therefore be stronger in one area over another.
The Australians are better in manipulative/musculoskeltal PT, I've found so if that's your interest , then stick with them. They also are good at Clinical Reasoning as they have had primary practionner status since the 1970's so they'll teach you to be an independent thinker as well. The UK is pretty good in Respiratory care and you may get a bit more exposure to wound care. The University of Sydney has some of the leading researchers in one method of stroke care and the UK has researchers in another.
So where do intend to practice finally?
Cost can also be a factor. Where do you live and can you afford to live away form home for prolonged periods of time? Will you need to go home often? Will you need things from home? Will you need scholarships? There are some good websites on studying in Australia, that you should look up as well (if you haven't) to make that final decision.
Just some things to think about.
Karielle