Surface Pro 2 vs Sony Vaio Tap 11

Which do you think is the best and has better bang for the buck?

Surface Pro 2 (link has expected price)- http://news.cnet.com/8301-10805_3-57603924-75/microsoft-surface-2-debut-pricing-specs-and-other-info/

Sony Vaio Tap 11 (expect this to be similarly priced as above) - http://presscentre.sony.eu/content/detail.aspx?ReleaseID=8811&NewsAreaId=2