Is it better than Win XP Pro? That's a subjective judgment. I think it's faster, for one thing, and it looks better. Networking is that bit easier in my experience, and security is tighter.
On balance I would say yes, it's better, but please don't spend the money just because I say that. I live, eat, and breathe software, and Microsoft software in particular. I'm a member of the Microsoft Office International Product Planning Panel, and although I try to offer unbiased advice and opinion here, you should take note of what others say before you decide.