Bieber vs. Prince Harry WHO'D YOU RATHER?

8/12/2013 2:37 PM PDT

Justin Bieber vs. Prince Harry -- Who'd You Rather?

It's a stripped down battle of the buns! 

Here's Justin Bieber (19) live and unclothed during a Thanksgiving serenade to his grandma (left) ... and Harry the Prince of Wales (28) wearing nothing but the family jewels during a naked billiards party in Vegas (right).

Question is...