windows - works with all hardware, and drivers for all hardware is written for it.
knoppix - $2.99-$9.99 or free if you download it vs. $199 for windows xp.
knoppix - gimp, open office, koffice, cd buring, java, plus 100s others = $5000 of windows replacement software.
windows - pretty seamless design
knoppix - easier to understand the kernel although learning curve is steep.
knoppix - solitare cards better looking plus 50 free games installed.
knoppix - 10 minute hd install.
windows - $10 software modems work.
knoppix - change it and make your own distribution legally.
knoppix - more fun.
knoppix - better for user that never downloads anything.
windows - easy to install any program. Although apt-get not too shabby, but needs work.