US research firm, Cowan & Company, has predicted that the is about to outsell the Wii.

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The index used looks at the from March 2010 to March 2011 (called the TTM or trailing twelve months basis) and Cowan & Company's Doug Creutz believes that the 360 will have finally supercede the on the last 12 months.

Creutz said: "This illustrates the significant shift that has gone on over the last year in the console space. The Wii was outselling the 360 and PlayStation 3 combined on a TTM basis as recently as January 2010, and was outselling the 360 alone by 2:1 on a TTM basis in December 2009 and 1.5:1 in October 2010."

He added: "Over the last three years, TTM total 360/PlayStation 3/Wii unit sales have remained relatively consistent in the 17-19 million unit range (18.2 million as of February), so this does represent a share shift as opposed to just a decline for the Wii. We believe the significant shift in hardware sales towards HD consoles is a positive ongoing for the US publishers, who earn the majority of their sales on the Xbox 360/PlayStation 3."

Thanks GamesIndustry.biz.

By Ewan Aiton