Well I don't know about a correlation between simple and 'better', better depends on the IC, Frequncy per CAS, Voltage, etc.
Between the (2) two listed the Corsair CML8GX3M2A1333C9 is both a better deal and a better kit.
It depends critically on both your CPU and OS. OS is simple you'll need a 64-bit OS to access >4GB of RAM. The CPU and MOBO can also limit RAM density and support.
Q - What CPU?
Q - What MOBO?
Q - What OS?
Windows limits - http://msdn.microsoft.com/en-us/library/windows/desktop/aa366778(v=vs.85).aspx