Seeing as how since both systems being released at the same time would have had a much different outcome on sales, why not compare holiday sales of 06' and 07'. You have to keep in mind of how many people who were buying a PS3 on release day probably already had a 360 from the previous year, or had some bad experience with one system over another, or, simply wanted a Wii over the PS3.
Where as, if the PS3 was released alongside the 360 in 2005, the wii would have been no where in sight... There's a lot of things to consider since numbers would have been waaaay different. They wouldn't have matched at all.
You've also got to remember that by the time you bought a launch 360 with wifi, a second controller, a game, and HDMI with Live, you're over the 600 dollars of the PS3... which at least has wifi... but, like i said, this is nothing more than a comparison of launch numbers, not a guesstimate on if the two launched at the same time.








