Both os work well. XP has system restore which can help you out when you have a bad driver install. XP has the cartoon look; even in classic view it is somewhat cute looking. XP takes up more in the way of system resources. XP is newer and [most likely] will have better hardware and software support in the future.
Win2k has a more business like look to it. There is no system restore and many things that xp does through a "wizard" you do manually. Win2k uses less in the way of system resources ie ram, hd space.
IMO win2k is for people who fully understand how to accomplish a given task. XP is more for people who do not fully understand or would rather not mess with configuring say a network.
I would say try and use both systems and see what you like.