The Sony, hands down.
Bigger screen, better processor, larger hard drive (granted, I didn't dig to see if either was faster), BluRay player (not saying much consider the applications on computer aren't great yet), but best of all, it's not
a Mac (okay, okay, that one was just to get the Macboys going
They have the same amount of RAM -- didn't dig enough to find the speed difference, though..not that it will matter much, unless the Mac is only DDR2.
They have almost identical video cards.
Seriously. Save some cash and grab the Sony. It will outperform the Mac.
What will you be doing with it, if I may ask, and why comparing PC to Mac? Just wondering..