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I think the question is not so much X5 vs. X3 but rather PPC2002 vs. WM2003. ALL x3s are WM2003 but X5s can be either PPC2002 OR WM2003.
That said, most software is now compatible with WM2003, so most likely, you won't have a problem with either Operating System. Also, in my experience, I have found that even those that only specify PPC2002 may be ok with WM2003. If there are specific programs you are looking at, post back to ask about them!
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