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The W8 is a new OS that invade into the tablets area. Do not sure that it is fair to compare them.
From other hand as I think the W8 as well as WP8 will be more popular in the future. Windows have much stronger background for that.

Here is a good WP8 overview that you may use to compare with Patrick Gray article
http://mobidev.biz/blogs/windows_phone_8_review.html?techrepublic