Source: http://xbox360.ign.com/articles/849/849158p1.html

Clash of the Titans: Call of Duty 4 vs. Halo 3
How did Infinity Ward go toe to toe with Master Chief?
by IGN Xbox 360 Team

February 1, 2008 - On January 21, 2008 the unthinkable happened: Microsoft announced the Xbox Live activity for the previous week and Halo 3 was not on top. "I don't wish to be melodramatic," said Bungie's Frank O'Connor, "but upon hearing that news, I started listening to My Chemical Romance and scrawled all over my tear-streaked face with soft crimson lipstick, screaming, 'Don't look at me I'm a dirty girl!' at the top of my voice." After the dust cleared from the bombs that went off in our heads and Halo 3 regained the top spot the following week, we began to ask ourselves whether Call of Duty 4 being on top was really all that surprising of an event.

Both games are the newest entries into blockbuster franchises with massive marketing campaigns behind them. Xbox 360 owners proved that there's room for more than one first-person shooter when they propelled both games to mind boggling sales numbers; Call of Duty 4 has sold more than 7 million copies across all platforms while Halo 3 sold over 3 million copies in just 12 days before going on to lead all games in sales for 2007. These are the games that are going to compete for the number one ranking for months to come.

Where do Halo 3 and Call of Duty 4 succeed? Where can they improve? What makes them so addictive? We explore the differences between the two titans. It's up to you to decide which game is worth your Xbox Live time.

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