In my opinion the PR is better for security to stay in Oz & gives you the flexibility to do what you want once there, it is more expensive but the working visa is only temporary & unless an employer helps out with the fees for the PR you'd have to pay for it anyway to remain there. Total cost for my PR application was £3,112.94. You can apply for your visa from anywhere in the world, you just can't be in Oz when its granted (well I couldn't as I'd applied offshore, but check your own circumstances with your Case Officer). Hope this is useful, but as recommended by others, research is key to deciding what is best for you. Feel free to PM me should you require additional information, I'd be happy to help if I can.