Sony almost always seem to publish numbers that "sold through" to customers, Microsoft numbers are generally "Xbox family" (includes 360's) or sold into channel (aka shipped). Microsoft also really likes to add weird stats like "bullets shot at zombies", "number of Titanfalls", etc.
Things were flipped in the previous generation while the 360 was ahead of the PS3. I guess both companies don't like to give official sales numbers when they are losing.
