There is no one “best” credit card in Australia, as there is such a large variety of credit card types and uses in the market.
To find your best credit card, you may want to look at your income, expenses, and the type of cardholder you are. Then, think about exactly what you want to use the credit card for to help narrow down your best credit card search.
You use your credit card like a debit card and are constantly racking up interest on your outstanding balance.
You use your credit card as a helpful financial tool and don't rely on it for everyday spending. You're only bringing it out for large purchases you otherwise couldn't afford in one go, in emergencies, or just when travelling/shopping online on overseas websites, and pay back this debt over time.
You use your credit card every day for purchases like groceries or to pay bills. You may do so to maximise the amount of rewards points you could earn. Compared to the habitual spender, you ensure your credit card balance is always paid in full each statement period.
You are a higher income earner and put over $5,000 a month on your credit card. You may use your credit card for convenience or to try and earn rewards points and game point hacks. You are strict about paying off your balance in full to avoid interest charges.