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The first evidence seems to support the 360/Wii versions selling better.

http://www.gamedaily.com/articles/news/guitar-hero-world-tour-launch-a-mixed-bag-says-analyst/?biz=1

UBS conducted checks with retailers like WalMart, Best Buy, GameStop and others across 20 states and found that the full bundle version of World Tour is "selling well despite relatively light allocations of the full-band kit." While the bundles for the Xbox 360 and Wii were "near sell-outs," the PS3 version was "more likely to be in stock," Schachter noted.

He continued, "Guitar Hero World Tour bundles were more likely to be available at Best Buy and WalMart across all platforms, while GameStop was offering full bundles only to those that had pre-ordered the title with game-only and guitar-only versions of the title available (and in stock) for walk-in customers. The next day or so will provide some insight into whether there was a higher level of pre-ordering customers that failed to pick up the game (this will be a key data point). Notably, Rock Band 2 bundles were consistently available for all platforms across each of the retailers that we checked."