Which of the two metaphors do you consider as the most effective, efficient, perfect, and suitable example

Which of the two metaphors do you consider as the most effective, efficient, perfect, and suitable example in explaining cooperation within public administration and why? 

Elaborate with appropriate references from the following links to the Center for the Study of Federalism provided below:

http://encyclopedia.federalism.org/index.php/Marble_Cake_Federalism

http://encyclopedia.federalism.org/index.php/Layer_Cake_Federalism

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