iTunes and Zune Software compared...

Does anyone use both the Zune and iTunes software routinely? I don't have iTunes installed (since I don't have an iPod), but do have the Zune software installed.

Can anyone who uses both at least somewhat casually give me a compare/contrast? I'm not looking for Fanboi's per se. I really would like to know "what's the difference" without having to install iTunes. Does one give me something the other doesn't? Can I see other people's songs recently played on iTunes? Any personal preference in the UI?

Thanks!

Rdaja