Where will there be the most support for you while you are studying? Will your DDs' dad be staying in Townsville or going back to Brisbane - and does that help your decision? What about ease of childcare arrangements/help from family and/or friends in each place? These are the sorts of things I would be thinking about. YOu want to go into your study with as many supports in place as possible. Also, the other great strain of studying tends to be finances - which town is less/more expensive to live in vs. your possible income in each place?

I guess what I'm saying is don't just go for the course that's the most prestigious - make the decision based on how well your life is going to 'work' overall during your study years. HTH!