Since all we have are the website and music, and we only have in game videos of one that are from most likely an early build, I'll just judge the site and music, and I'll give the edge to Xenoblade. Both had great, if typical, pictures, but the Xenoblade music is more appealing to me.
A flashy-first game is awesome when it comes out. A great-first game is awesome forever.
Plus, just for the hell of it: Kelly Brook at the 2008 BAFTAs