As Muttley says "John Williamson (and yes, I am biased), I believe does the best version..."
I too must agree.
It was in 1988 when I was on a trip to Oz that I first heard of John Williamson and his version of Gum Trees. I loved it, brought a couple of his albums, and enjoyed them too. This rekindled my interest in music, so much so that I decided to start playing again.
I have not looked back since, I still enjoy playing and after nearly twenty years I still perform Gum Trees, from time to time, in clubs around South East England, and it still goes down well. People always enjoy a light hearted, fun song with good sing along chorus, so let's not get too "deep and meaningful"