The UWA course seems to be more mathematically oriented, but the Curtin course seems to leave more room for optional units, which could be dedicated to achieving a similar level of mathematical education, anyway. UWA also has a required unit, "Experimental physics," as part of the course, while Curtin appears to place a greater emphasis on laboratory experience throughout the rest of the course. As the UWA website isn't cooperating, I'm not currently able to look deeper into the particulars of the units offered, but I'm sure similar topics are covered by each university.
Both are great universities from my understanding. UWA is possibly somewhat more "prestigious," however, if you're looking for a university with a prestigious name, you're probably in the wrong country. From what I've heard from students in the Engineering department, UWA places a far higher value on theory, whereas Curtin increases the emphasis on lab, and technical experience. I am not certain whether this carries over to the other faculties, but I imagine it would be a similar situation. If you're interested in a deeper understanding of the theoretical side of the subject, I'd probably be slightly more inclined to recommend UWA. Both of these uni's are great, however, and I'd personally just pick whichever would be more convenient for me (in terms of travel, networks with older students in times of need - don't worry so much about this though, this will develop regardless). Both will provide you with a degree, and extensive knowledge in the field of in Physics, which is ultimately what you're aiming for.
Edit: I'm looking to transfer to Curtin for a double in Engineering/Physics, so if you choose Curtin, you'll know a PF'er, lol.