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If you're using Ubuntu (with Unity), then it's understandable why. Kubuntu – KDE in Ubuntu – is unbearable compared to other Linux distributions, like Debian, simply because there's no delay in the mouse reaction in the main menu. This is irritating, and KDE in Ubuntu is just plain awful. Gubuntu – the third GNOME – is roughly the same as Unity. It's hard to say which of these desktop environments is worse. LXDE might be an option, but I still couldn't install and configure everything I needed in Ubuntu, and it also has less mature package versions than Debian stable, let alone oldstable. And in general, if you have to choose between Debian and any distribution based on it, even through other Linux distributions, then Debian is definitely the better choice.