From my experience, Arch with KDE and XP/Win7 are extremely similar with regards to user experience quality, so that I myself wouldn't be willing to call one or the other better. At this point, a person more used to Windows might get annoyed by having to edit config files on Arch/KDE every so often, and a person more into Linux might be frustrated that in Windows, some things can't be easily fixed. But these are more differences in preference than in quality.