Which One Is Better; 4 Way Stop Vs Roundabout

this is a global question; Which One Is Better; 4 Way Stop Vs Roundabout
I can write lots of thing through the experiments and researches to determine which one is better but there is a fact that Americans are fan of 4 way stop and English are definitely on roundabout side. but lets watch the Mythbusters episode trying to find out the answer… “Which One Is Better; 4 Way Stop Vs Roundabout ”
http://www.youtube.com/watch?v=OvoFjirrgYA
http://www.youtube.com/watch?v=OvoFjirrgYA

Personally I still feel more relax with 4 way stops than roundabouts which the NY Times article “Roundabouts: Efficient or Annoying?” which can be read at here shows that some are thinking like me.

Last, for low density roads it seems like roundabouts are better (of course with the countries people tend to obey the traffic rules) however depending on the actual traffic flows a 4 way intersection with intelligent traffic lights could be quicker overall for medium or high density roads.