Most in depth analysis of the 2 system puts the Xbox 360 way ahead of the PS3 for raw power. You have to consider all of a machines specs and not just speed, ram, or any single spec.
http://xbox360.ign.com/articles/617/617951p1.html
I consider this article fairly objective and in depth.
And of course there is always the anandtech articles which are full of tech mumbo-jumbo.
http://anandtech.com/video/showdoc.aspx?i=2453