PS3 SW > 360 SW (Timely Basis)

[FishyJoe]

For the US market:

First 18 months software units (US):

Wii - 50 million (not including Wii Sports)
X360  - 28 million
PS3 - 20 million
PS2 - 42 million

First 18 months hardware units (US):

Wii - 9.5 million
X360 -  5.2 million
PS3 - 4.2 million
PS2 - 8.5 million

http://kotaku.com/5010214/nintendo-wii-has-highest-software-sales-for-first-18-months