There is no comparison. Lessons learnt in outback flying far outweigh the gains of instructing. What do you really know about flying at 300hrs to be able to pass on to anyone effectively? Anyone can teach a monkey to manipulate the controls of an aircraft.
I say this as someone who did instructing pretty much as a first job -for a brief while anyway.
Heading outback way does show to all that you are truly keen for your passion of flying. Takes a lot of courage to leave a city instructing job (although usually paying peanuts anyways!) for the uncertainty of the bush.
If you really want to learn how flying goes then head for the bush adventure. If you are in flying for the glamour and esteem, then stay in the city.
Choice is yours. Good luck to both.