By now, US/US Dollar.
Sam gradually washes off its debts thru 货币战。
钞票是否越宽松越值钱?
No.
depends on if it's 世界货币。
Again, US Dollar is winner.
In contrast, Euro is not a real 世界货币。Therefore, Europe cannot print money to save itself (like Sam did) in present crisis. Because even Europe could print the notes but none will use it unless it's US Dollar.