Coming from someone about to switch to Android, it's just a matter of taste. I have played around more with Samsung devices (Skyrocket, Note), though I also played with the Vivid and found it underwhelming. What's interesting Kevin is that you seemed totally sold on the One X, meanwhile there are TONS of people who bought one who seemed pretty unhappy with many of the functions and issues. And a group are marching back to ATT to return them too, though I suspect this happens with many new phones.
And its this that gives me cause for concern where I to get the GS3 rather than the Skyrocket. I DO believe the GS3 has some very advanced features, and a pentile display that may last longer than the non-pentile super AMOLED on the Skyrocket. Regardless, Samsung is clearly the leader when it comes to hand held while HTC is trying to play catch up.
Yes, the One X is a nice phone, no arguing it. But it will be interesting to see once ATT has it side by side with the GS3, which may blow its doors off.. Time will tell.