Reasons ro choose Kubuntu over Knoppix?

[Max Q]

This is a genuine question, not flamebait. I'm looking to get back into
Linux, and have narrowed my choices to either Kubuntu or Knoppix (being
an irreformable KDE fan).

I am very interested to hear of the advantages of Kubuntu over Knoppix.
the Ubuntu family seems to be taking off at an astronomical rate, but
the purity of commitment to FLOSS is a bit of a nuisance to those of us
with mp3s we want to listen to while watching stuff courtesy of nVidia,
na?

So any practical suggestions on why Kubuntu would be a better bet than
Knoppix would be greatly appreciated.

-- 
Non sum uni angulo natus; patria nea totus hic est mundus. - Seneca
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