there many factors to consider

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.If you are going to put your two children to Shanghai International school, the cost will be more than 120,000 yen per year. That means your income is only 280,000 yen pa left (assuming 400,000 is after tax), which isn't much for a family of four.

. are you planning to let your child study in China for high school?

. are you planning coming back to Aus in future? If yes, you may not be able to get the similar pay by the time. Aus company will be reluctant to hire you.

. what is the chance that you get pay rise, promotion in either situation.

. can you still get the same job in Aus if you cannot cope with 人際關係 in China?

. which one is best for your children education?

. Shanghai air pollution is still very bad. I just came back from there.

There are many others but these are just most important.