There is no actual answer to your question. It's all down to what you want the PC to do and personal preference. Read as many articles as you can and talk to many people. I personally prefer P4 but thats only because I like Intel. The speed of the PC does not only rely on the processor it is a combination of Processor Ram Cache size level 1 and L2 and system bus. Ram speed and type also plays a huge part so do your home work well..