I don't know I compared them in the store yesterday and the Samsung seemed laggy to me. The X snapped through every button touch and the video recording was excellent. I liked the feel of the Samsung but it has less memory internaly, no HDMI output and seemed to lag. People are talking about the processor being faster but I didn't see that testing them. Just going from the dock to the home screen it took a second for the S and the X was there as fast as I could push the button.