The New Xbox Experience also lets you install games to the hard drive, so that advantage is taken away.
Many PS3 fanboys constantly use the "potential" argument. The fact is, the console has been out for over two years (not including pre-development time) and it continually fails to live up to it's "potential". There is nothing that can be done game wise on the PS3 that can't be done on the 360 too.
I realise I am coming across as a massive 360 fanboy, but the fact is, my previous two consoles were the N64, PS2, so I profess no brand loyalty. I simply pick the best games machine having weighed up the factors, and to me it's pretty clear that the 360 is the pick of the two majors this generation.