Which is better

If it's for the system in your signature, then you do not need DDR3 memory. DDR2 is perfectly fine for a Core 2 Quad based system. The Asus Maximum Formula Special Edition motherboard doesn't support DDR3 memory anyway.
 
Depends whether you're using up all the memory.

For most people, 4GB of C4 RAM would be better than 8GB C5 RAM, for example.
 
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