I was totally sold on the PS4 until I read about the Xbox's Twitch integration.
Having been interested in getting into streaming this next generation, having that functionality built is definitely nice. Sure the console is more expensive, but it's offset by the savings from not having to buy additional streaming hardware.
Yes, I know that the PS4 will have Ustream integration, but really... Twitch is where it's at.
Am I the only one that's fixated on the OS-level Twitch features?