It depends where you live. We went to go blacktown last time as they have a good reputation and they wouldn't take us, as they said westmead was our closest.
We went back to nepean (had our first there and loved it) as the travel was only 25 min down m4. As I have heard bad things about westmead and a few friends had horrible experiences. Nepean will take anyone. So with number 3 due next year we will go back there again.