I was wondering which of the following scenarios below is more beneficial, in terms of "link juice", for Site C where:

Site A is a huge site with PR=8
Site B is a subdomain of Site A with PR=0
Site C is an average site with PR=5
Site D is a subdomain of Site C with PR=0

Sorry if this is confusing, but I didn't know how to get around the "new users cannot post URLs" rule. Besides, it's an opportunity to relive your high school days when you were taking your SATs!

Scenario 1
Site A is linking to Site B, and then Site B links to Site C.

OR

Scenario 2
Site A is linking to Site D, and then Site D links to Site C.

Thanks in advance...TT