It really depends on what you want out of your gaming experience and how much you want to spend. It's really unfortunate that the Super cards appear to be ridiculously priced in Australia or I'd suggest those. You should expect 20-25% more performance out of the 4070 Ti than the 4070 so long as you're not CPU bound. I'm guessing the 300 AUD makes the 4070 Ti around 30-35% more expensive.
Here’s your answer. In fact he’s from Australia. He basically says if you are in the USA where it’s only $50 dollars difference then get the 4070 super. But he says if you’re in Australia get the 4070.