I have used The One X in person once. But I have not been able to compare it with the GNex in person. I agree with you on the speed front, since even I don't think the One X is any significantly faster than it,at least for the apps in the market now. Regarding the screen though, I feel the One X looks better. Perhaps its because of the difference in the screen technologies. The reason I chose the One X over both of these splendid devices is because I like its design better and because Samsung are terrible at Android updates.