Maybe greek olive oil is the most famous, but not the best; I don't think there is an official competition or comparison.
A decade ago a friend of my mother that had a small olive farm in Jordan used to send us a couple of 5 liter cans of oil and olives every year. I can say that was the best olive oil and the best olives in my life, but there is no way to prove it.
A decade ago a friend of my mother that had a small olive farm in Jordan used to send us a couple of 5 liter cans of oil and olives every year. I can say that was the best olive oil and the best olives in my life, but there is no way to prove it.