First off, i'd like to start by saying that these specs are not completely official. It looks as though both systems will be worth buying, but in the end it's going to be the PS3 for me. I have been researching the two systems alot and at every credable website i browsed, xbox 360 has more memory, but less of it is dedicated to superb graphics like the PS3.
You can decide on your own. The link shows the specs of both systems side by side.
http://www.winsupersite.com/showcase/xbox360_vs_ps3.asp
these two pictures showing the difference in graphics quality, PS3 owns xbox360