your front side bus is the speed at which the motherboard operates. Your motherboard is what makes all the components of a PC "talk" to each other...2 of the most improtant things are RAM and CPU.
If your doing applications that are pure number crunching and don't need to access the memory, the faster cpu will produce better results. However, in real world performance memory is critical for speed. In this case your memory is being accessed at a 33% increase, with a 8% decrease in cpu speed. This would probably be faster depending on how memory intensive the application is. To say one is "faster" than the other would only be relative to the task being done. So your best bet is to test them with the application you plan on running (or applications).