They have the same content, it's just the PS3 has more titles that show up in the menus. If you searched manually on the xbox you could find the same shows. The PS3 is 10 times better than xbox when it comes to the apps for Hulu and Netflix.
For instance when you look at horror, on xbox it just shows the most popular, on the PS3 it shows all of those plus it breaks it down into different horror genres.
I can confirm this as I have both a PS3 and XBOX that I use regularly for viewing this content.
360 GT = Atlienzz
PS3 GT = Atlienzz1979