Totally agree with you on that one Schibo. A lot is made of Win XPs lack of compatability, but I for one have had no problems whatsoever. It seems the only programs that have major problems are the ones that address the Kernal such as older Virus scanners etc.
Even some old DOS programs run better in the emulated DOS of XP than they ever did in 98s.
As for Linux it is a very fast and capable OS, but the problem is it doesn't support (more specifically software) as much as the Win9x, NT line of OS's. As such I don't believe you can compare them both in many situations.