And kubuntu looks more like a windows environment and can act like it. However I recommend unbuntu for the fact that it doesn act like a windows environment but looks more like a mac. All in all you will get the same results from either but I think you will enjoy ubuntu much more due to looking a lot different then your everyday OS.
Fluxbox is just a Window manager, where as KDE and GNOME are desktop environments, and they too have a window manger though.
KDE-kwin (default), can also use Compiz
GNOME- Metacity (default) can also use Compiz and others.
Fluxbox is a minimalist graphical environment. Good for slower machines and fun to mess with. I like the *boxs(black, Open, flux)
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