The AMD proccessor becuase if im not wrong having two processors does not mean having double the speed.
Having 2 means that once one is full it then goes onto the other proccessor, it doesnt use them togeather at one time. So in actual fact it's much more lkely that you wont use the second one as much as the first one becuase you RAM does the most work not the CPU as in for running applications,games etc...
Please correct me if im wrong