From what I understand, one of the main differences is the license and the degree of development (xorg seems to do better in both areas). I think you will find a lot of information via google. Most linux distro's (recent versions) have allready switched to x.org
In my experience there is little difference in configuration, but I would recommend using xorg.
Also, it wouldn't hurt to give more information: how did you configure X to begin with? Have you read the logs? What exactly have you tried?
And debian 2.2.something may not be the best system to start with if you are a new to GNU/Linux. Many newbies (including myself) find distros like Fedora, SuSE and Mandrake alot easier to begin with. Just my opinion though, so feel xfree to ignore me