DIfference between X264 and Xvid

As some of you may be wondering what the difference between x264 and xvid are Check This X264: http://www.youtube.com/watch?v=554TVpeMii0
Xvid: http://www.youtube.com/watch?v=FuSRTzDXH4Y
Own3d.tv Xvid: http://www.own3d.tv/video/43205/BORING_Xvid_Testing
Own3d.tv X264: http://www.own3d.tv/video/43201/BORING_X264_Testing

Fix'd the links for you.

you cant really notice any difference on youtube.. upload it on ow3d.tv, but there is a better result of xvid on youtube