Question: is optus or vodafone better?
Answer: If you're after a SIM-only plan, Optus is the cheapest choice – by a small margin. $39 per month gets you 10GB of data with Optus, while you'd pay $40 per month with Vodafone for the same allowance. Optus' plan is contract-free, while Vodafone requires you to commit to a 12-month contract.