Xbox 360 will outperform PS3 in software for years - Mattrick

When we asked to clarify if he [Microsoft's Don Mattrick] meant Xbox 360's next three or four years of software will outperform PS3's, and that PS3 will be unable to make up the ground, he replied: "That's what I said."

Mattrick famously hung the Microsoft's E3 press conference on the claim that Xbox 360 will defeat PS3 worldwide in this generation of consoles and told Eurogamer that he came out and said it because he was fed up of being asked about it.
"I did the math, I did the math a different way, I did the math...there was no equation that I came to where I got a different answer, and I went, 'You know what? This is getting boring,'" he said. "Like, instead of everyone standing on the sidelines trying to hedge, I'm just going to say it."

http://www.eurogamer.net/article.php?article_id=200325