WKC no doubt! Level 5 > SE no question about it. While it seems Level 5 develop their games with care for both artistic quality and their wallets, it seems like SE develops their games with care for their fat wallets only.
Also, I know this is common practice in Japan, but shelves over here are filled, I mean FILLED, with both used and new copies of FFXIII. And I have spent countless of hours in gameshops in Tokyo lately (2-3 weeks) and I have yet to see even ONE copy get picked up and bought. Of course I'm not the all seeing eye, but I think there are A LOT of unsatisfied and disappointed FFXIII buyers out there. I think the same will happen here in the west after it's release. From what I've seen, FFXIII looks amazingly mediocre.
Oh, and you got to love the man talking in those WKC videos! haha, his voice is filled with excitement ^