A couple of practical considerations for Kubuntu vs Xubuntu would be that KDE has a lot more developers working for it and some of them are paid. KDE has in place a desktop strategy, smal screen strategy and is releasing a tablet strategy, all based on the core KDE.
While people have fled from Gnome 3 to Xfce, that will most likely be temporary. Ultimately Unity and Gnome-shell will mature and get the kinks out. Both are poised for tablet market and Unity for other devices as well.
I really like Xfce, I used to be a developer for a distro that was only Xfce based. However, in the end, Xfce has a limited development staff and will find it difficult to move into new devices (they are struggling to change to Gtk3, let alone an entirely different interface for, say tablets).
If your goal is to have a more traditional desktop interface, Xfce (and Xubuntu) can provide that. However, KDE (and Kubuntu) can be configured to provide that, too and you would have all of the advantages of the underlying KDE architecture for the future.
While people have fled from Gnome 3 to Xfce, that will most likely be temporary. Ultimately Unity and Gnome-shell will mature and get the kinks out. Both are poised for tablet market and Unity for other devices as well.
I really like Xfce, I used to be a developer for a distro that was only Xfce based. However, in the end, Xfce has a limited development staff and will find it difficult to move into new devices (they are struggling to change to Gtk3, let alone an entirely different interface for, say tablets).
If your goal is to have a more traditional desktop interface, Xfce (and Xubuntu) can provide that. However, KDE (and Kubuntu) can be configured to provide that, too and you would have all of the advantages of the underlying KDE architecture for the future.
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