Is there a link or any side-by-side comparisons detailing why one would choose Kubuntu or Xubuntu over Ubuntu? I am running on a somewhat older machine (Dell optilplex 745 tower), so how would this figure into the decision?
closed as not constructive by Alvar, Thomas Ward♦, Eric Carvalho, Jorge Castro, Geppettvs D'Constanzo Apr 22 '13 at 22:21
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I don't have a link handy but the main differences are the following:
There's also Lubuntu and Fluxbuntu which are using different desktop environments, respectively LXDE and Fluxbox. Fluxbox would be the fastest and lightest, but not exactly user-friendly, especially if you come from another non-unix-line Operating System. Other distributions that are lighter and that might work better depending on how old and powerful this computer is, but I will let you do the research about those.
As noted in this answer's comments, LXDE is not actively developed anymore.