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My gut feeling tells me both schools are great, but I would love to live in Sydney (I'm from San Francisco and Sydney is so similar). Either way, I'd be happy at either institutions.
I think if you understand the pluses and minuses of doing med in Australia in general, you can't go wrong with either. If at all possible/affordable for you, I'd recommend you fly out, sit in on a lecture or two, meet the deans and some of the students, do a boat race...
Visit other schools, too. I was surprised by my choice by the end of my trip.