Once a dry, business-geek term used to describe different products or services one could order from a supplier, SKUs (Stock-Keeping Units) have, in the gaming world, come to represent different versions of the same game console.

When Microsoft’s Xbox 360 launched with separate “Core” and “Premium” versions (with “Core” lacking a hard drive and other features), some analysts suggested that releasing the same product in two different flavors would create chaos and confusion in the marketplace, sending would-be game console buyers into fits that would culminate in customers banging their heads against plastic display cases until the Target aisles were flooded in idiot-blood.

Though the “Core” system came to feel like a bit of a neglected sibling, the multiple-SKU strategy must have worked for Microsoft, because they went on to release even more versions of the Xbox 360 including the Black and It Has HDMI, So You Can Shut Up About HDMI Now edition and the So You’re a Halo Dipshit version.

The SKU strategy was also a key part of Sony’s launch of the PlayStation 3, which was released a 20-Gigabyte version (which lacked Wi-Fi and memory card readers) and a 60-Gigabyte higher-end version. As happened with the 360 launch, the pricier SKU outsold the gimped version, leading Sony to eventually discontinue the 20-Gigger and then release a middle-of-the-road 40-Gig version and an 80-Gigabyte system. This time, customers really did want to bash their heads until their brains drew blood, but only because of the lack of decent games for all incarnations of the PS3.

Interestingly, the game console waging the current-gen battle against the 360 and the PS3, the Nintendo Wii, was not released in multiple SKUs. It was simply priced lower and sold in a single, easy-to-shop-for, one-console-fits-all version.

Guess which one has sold the most.