I prefer both because they have the biggest value in market compare to the other currency. But in the country where I live, the value of NZD here is lower than USD. I like to earn USD because it has a bigger value than here. Among the currencies, Euro has the biggest value if it converted into Philippine money.
If I earn something online I wish I could earn euro so when it converted into NZD it ha double value.
In business world i think every currency is very important. Without these currencies, there is no value or there is no market trading all over the world. Many businessman will use whatever currency as long as they will earn from investments. So whatever currency it is, there is always value in the market no matter how big it is.