[ubuntu] Xubuntu or Ubuntu Server+xfce

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http://ubuntuforums.org – Hi there. I'm planning to install ubuntu in an old computer (512MB of RAM) and I want it to have xfce as its DE. So a question arised: Which of the following options would be lighter for that pc: Xubuntu or Ubuntu Server + xfce ? Any recomendations are very welcome! PS: I want to use xfce (not gnome, kde, lxde, etc.) Thanks!!! (Hardware)