The desktop CD allows you to try Kubuntu-KDE4 without changing your computer at all, and at your option to install it permanently later. This type of CD is what most people will want to use. You will need at least 384MB of RAM to install from this CD.
PC (Intel x86) desktop CD:
For almost all PCs. This includes most machines with Intel/AMD/etc type processors and almost all computers that run Microsoft Windows, as well as newer Apple Macintosh systems based on Intel processors. Choose this if you are at all unsure.