the athlon if i remember correctly is a dual core processor.
the intel is quad core.
So windows, or whatever operating system you run thinks it's using 4 processors if you use intel. two processors if you run AMD.
Obviously, the more processors, generally the better performance.
So the Intel is the hands down winner here.
However, both are really designed for 64 bit Operating systems. Unless you use Windows x64 or another 64 bit OS, then you arent using the full capabilities of the system, and it may not be worth spending all that money on a processor you cant really utilise to the full.