For your consideration, the best-selling game (non-bundled, of course) of all time runs best on the paltry X360. From digitalfoundry:
For those with both consoles, the choice of where you spend the majority of your online gaming time must be factored into any purchasing decision - as was the case with Modern Warfare 2 before it. However, from a technical perspective, there's little doubt that the Xbox 360 offers the better experience: superior image definition, and a pleasingly smoother run of play.
In many ways, the core experience of playing a COD title is defined by that 60FPS target frame-rate and the advantages that brings. Neither version of the game sustains it, but the Xbox 360 game comes closest and thus it just feels like the more playable, satisfying game. Factor in the higher resolution and what feels like a bit more polish, and it's clearly the pick of the two HD console releases.
http://www.eurogamer.net/articles/digitalfoundry-call-of-duty-black-ops-faceoff
