It's common for leading cases to be published in several law report series.
According to rule 2.7 in the Australian Guide to Legal Citation (AGLC), the "most authoritative available version of a case should be cited."
When deciding which version of a case to cite, rule 2.3.1 sets out the following hierarchy:
Tip #1: To find out if a case has been 'reported', look up the judgment in a case citator (e.g. CaseBase and FirstPoint).
Tip #2: For Australian judgments, CaseBase always lists the most authoritative case citation first.