The difference between Microsoft's Natal and Nintendo's Wii for game designers

Please post here in the comments (bullet points are fine, but be precise!) what the difference is for you as game designers between the technology behind Microsoft's Natal and Nintendo's Wiimote.
What can you do with one that you cannot do with the other?

I challenge you that there is only a handful of points, but that they are much more important than 'more limbs'.