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Yeah, Kate's right. I don't think you can go wrong, and unless you have redirects that disagree with your preferred version, go with the non-www. If you're using standard www and non-www redirects use the one that shows up in the search bar for the site or area of the site that you're submitting. We have a site in Google News that is www. and the news is non-www. For no reason, but we haven't bothered fixing it. We were included on the non-www. So it's possible and likely that both would work fine, but I know for sure that the one that shows up in the URL of your feed works best.

Thank you Kristina; I'll take a look.