PS3 has a higher attach rate than Xbox 360?

[MikeB]

Let's take Assassin's Creed as an example, this game had a simultaneous release. It was only a 360 timed exclusive for several months in Japan.

The 360 install base around launch according to VGChartz data was about 12-13 million and the PS3 install base was around 6 million. So a ratio of about 2:1 in favour of the 360. So 66% vs 33%.

According to VGChartz data, the PS3 version sold 3,35 million copies and the 360 version sold 4,47 million. That's only about a 1.3 to 1 ratio or 57% vs 43%.

And that's regarding a 2007 title, now it's 2009, the install base ratio is much closer now (about 55% vs 45%) and various multi-plaform publishers have even revealed that they generated more money on the PS3 in 2008 than for the 360, despite the 360's install base advantage.

So the prospects for multi-platform releases are very solid on the PS3.