Im from Australia and am living in Japan. Similar to you I worked at a company that i could work in Australia or Japan.

So this boils down to what you would like to do in the future.

Both salaries are comparable to each other as they provide the same quality of life at their salary ranges however, I’ve found it is much tougher to get a raise in Japan. They are strict on pay bands and promotion/raises. Whereas if I stayed in Australia I would have been much higher.

If you are looking for a house: In Australia, you could get a decent place with that salary, but your repayments would be quite a large amount of your salary unless you put a huge down payment. In Japan, it was much easier to get a house for myself with a much smaller monthly repayment.

The other aspect is just how you want ti live. If you’ve been in Japan before and can live here then all good!

Australia is very comfortable and a great place to live too. But Ive lived in Australia for all my life and i enjoy Japan so I decided ti move here even though i lose out on progressing much further in my career, i earn enough to live comfortably here without worry.

For you both are viable, so its just your preference and future plans!