Here's someone who finally did the big comparison: Which it the easiest one to install. A bunch of screenshots and it ended in a draw!
It's found here at the TechRepublic blog
At the end of the day, I did not find one easier to install than the other. So all of you Linux zealots that say it is so much easier to install Linux than Windows XP are wrong and I will even go out on a limb and say that Windows Vista will be easier to install than any Linux distribution available today.