Animal Crossing is a much cuter game than LBP will ever be. It also extremely pointless. My sister, my girlfriend and me tried to get into the DS version but we never got into it. However, we're big fans of the genre: Harvest Moon or Viva Pinata. That said, kids will love it. Even though the Wii isn't a kiddy console, it's the console families are owning so I really see this game being under a lot of Christmas trees.
On the other hand, Little Big Planet is a behemot of content that takes an old concept (2d platforming) and gives people the creative ability to do pretty much whatever they want and share it with the world. However, this game will most likely sell to older gamers that used to play 2d games when they were younger. It's good because, it's the core of the PS3 userbase.
So, even though Little Big Planet is a much better game, it can't compete with Animal Crossing saleswise.
How many cups of darkness have I drank over the years? Even I don't know...
