I own a couple of the alternatives to the ipad (Android and/or WinCE). From my own experience and from reading the posts from others, it looks like at this point in time the ipad offers the best overall experience with a slate device. The other devices, including the two you mention, offer a combination of less than stellar hardware with OS's which aren't really delivering what they probably will by next year.
If I were in your shoes I would either bite the bullet and purchase an ipad or wait and see what next year's offerings bring our way with other platforms.
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