Ah yes, sure you will find this topic a few times on here.
Shortly returning to Auz from UK.
Spent 6 years in Auz, been back in the UK 5, now leaving UK on a permanent basis.
You'll never find a perfect answer, but you will spend a long time searching - so try to enjoy the journey.
Be flexible, because just when you think you have it all pinned down life throws something in unexpectedly.
And if you're not sure try to keep your options open.
For myself and my wife the balance went to Auz for work / life and a future for the kids.
Also getting out of the mortgage trap.
Exchange rate happens to help, but that's just luck.
Time will tell!