The singer, who is engaged to Australian Liam Hemsworth, said that she believes Australians are more respectful.
"[Australians are] way hotter. There's no competition," Cyrus told People.
"I think there's a masculinity about [Australian guys] that is probably like growing up in the South, like what I did. They are a little bit more respectful, I suppose."
Cyrus's engagement ring allegedly cost Hemsworth an estimated $250,000 (£161,000).
The couple dated for three years prior to getting engaged.