ColourOfSpring - 5:56 pm on Apr 6, 2013 (gmt 0)
I'd submit the domain you are using - www or non-www. Yes it is confusing in that Google treat them so differently, just because technically they are different domains (www being a subdomain).
I can never for the life of me understand why Google treat www and non-www as different. 99.999% of the time one is an alias for the other (in reality). Why do Google treat them as distinct websites? They should make a special clause for the "www" subdomain as being an alias for the domain name. I see so many sites that were "www" go to non-www and vice versa because they believe Google will treat the "new domain" as a "new site" and thus side-step whatever Google penalty they are under (never tried this with my own sites, but I see this ALL THE TIME with sites that join the directories I admin).