By preference while you're alive, but whatever floats your boat, just curious...

Personally the obvious favourite is Whitlam who got us half way to Norway's sovereign fund and gave me mostly free university (yes kids it was for a brief span), until the CIA said no (if you believe). Hawke was a personable, likeable weasel, or maybe that was the rise of neoliberalism. As to worst I'm going with Morrison a toxic moron, with Johnny Howard as close runner up who did far more damage but had a less punchable face and did gun control. Honourable mention to onion eater Tony Abbot as the most tolerable liberal PM, mostly because he actually holds a hose, even after politics (as I understand it).