Ultimately, it comes down to personal preference. We recommend signing up to both and seeing which one you like best. But for us, the winner is CoinSpot, in fact we even rated them our number one exchange out of all of the exchanges available to Australians.
The reason is simple: they offer a huge amount of altcoins that you can buy directly with Australian dollars, which means you don’t have to mess around with buying BTC, then sending that to another exchange to buy your altcoins.
Their support is second to none, and finally, they’re an Aussie company, which means more money stays in Australia and they’re employing Australian people.