I'd say there is a winner : Linux. Isn't it interesting that a software developped by a team of hacker (I'd say a chaotic, huge and ever growing) can make a monster like Ubuntu and get performances that don't pale against another OS which is designed by a very organised, super funded, super focused team of carefully selected programmers...
Ok, I assume a rather romatic view of linux development, but I'd bet I'm not that far from reality :-)