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How do Australian players generally compare legit-looking online casinos? I am trying to find a resource with useful details.

A comparison site I saw included plenty of offshore brands in one place. That makes it easier to work out which details need checking. Australia's regulatory framework is hard-line, so many operators are based offshore. A directory listing is not the same as approval.

I would say I've seen which resource you mean - it's probably https://australianonlinecasino.eu.com/en-au/ - please read the fine print and independently confirm the operator's jurisdiction. As a final check, make sure the details are up to date.