I.M.O.G. said:
I like XP slightly better, just because of a few handy features. Some admin utilities are slightly different and handy I believe, and integrated cd burning is very simple and nice.
XP can be tweaked faster than 2k easily. How smooth and responsive either system is primarily depends on the person doing the tweaking. If you take XP and just turn off the theme service, and set visual effects to performance, XP will outperform 2k easily, most noticeably at boot time... Largely thanks to the automatic background optimizations which occur by default in XP. If both are tweaked, there should be little difference between the two, but XP should still be better at boot time.
I really like 2k, and its naturally lighter on system memory, but I just favor some of the added convenience of a default XP installation. I would be just as satisfied using either as my own workstation, but I assume I have this opinion because I would prefer to service an XP machine rather than a 2k... I do both every day, and there really is very little difference, but XP occasionally shows an advantage or two which leads me to prefer it.