Best of both for me
I like the XFCE GUI more than unity, but I like the default packages that come with Ubuntu, so I install Ubuntu then the xubuntu-desktop package and select XFCE at login. As it remembers the last selection that only has to be done once. This means I get Libre-Office, Shotwell, Nautilus (with Dropbox) easily and quickly.
Works a treat and if I need to use an old machine then a xubuntu is a good starting point,