Well, that's one OS I've never used. But isn't XP geared more toward desktop use while this WTS, form what you are saying, is a server. How can they be compared?
WTS is a user desktop when you don't have a windows machine, as in, say you are using a Sun Blade and you need to access Windows, WTS is the tool we use at WPAFB.....
It's actually very similar to XP but, as you said, it's run directly on the server.
If XP was nearly as stable as WTS, well, it isn't so why bother?
swc,
its not an os its server software that runs on windows.