Which is more suitable for living in Zhihu, Europe, Australia and the United States?

This ..... each has its own advantages.

If the population density in Europe is relatively high, it may be a little uncomfortable (I mean developed countries such as France, Germany and Britain, and you don't want to go to Serbia)

Australia has the highest incidence of skin cancer, not one of them!

Ultraviolet rays are very powerful and have an ozone hole.

But life is also good. Winter is about 16 degrees (based on the southwest coast), which is quite comfortable.

American immigrants are naturally a good choice, but living in a country where everyone can buy guns is a bit creepy. Imagine walking down the street and suddenly being bounced by a pistol. Although it is basically impossible, it will not be so comfortable psychologically. )

In addition, there are certain racial discrimination problems in the United States. ...