The NPD Group has tallied up all of the SKUs for Rock Band 2 and Guitar Hero World Tour -- both multi-instrument packs and separate games -- and found that Activision / Neversoft's rocker came out on top with 3.4 million units sold last year, twice the number achieved by Rock Band 2 (1.7 million).

Though the staggered release dates (especially for Wii) didn't help matters, this hardly indicates a terrible loss for EA's side. The Guitar Hero branding is, after all, a powerful force to be reckoned with. We'd be interested to see how the original Rock Band fared last year, given that it's also competing for living room space alongside the other two. And hey, why not throw in some Rock Revolution sales data? We could use a laugh.

This article was originally published on Joystiq.

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