I mean it’s all up to personal preference. But when mainline open up recruitment they get thousands of applicants. They have enough on the hold file to fill courses for a year (what other Aussie carrier can say that) and when they reopen applications again sometime in the next 12 months for only a few weeks they’ll get a few thousand more applications, that’ll stock the coffers for the next 3-4 years in the future.
Most Australians want to live in Australia, and mainline has the best T&Cs and overall career prospects of anyone based here. With the only exception being a quick command, you’ll have to go elsewhere for that.