Pentium 4.

Pentiums (since the Pentium 3) have been able to limit themselves so they don't overheat. If the CPU fan dies suddenly, or some other unknown issue occurs, the Pentium 4 will automatically detect that its running too hot and slow itself down. AMD processors don't do this, so if something happens you run the risk of actually melting your processor off your motherboard. The pros of using AMD is that its cheaper and generally a bit faster, but like I said that extra speed doesn't exactly counteract its main weakness.