To be fair Sony are producing a million consoles per month.
The demand just seems to be higher for the PS4s, but its still early days and could turn around for the Xbox One.
That production number is a guess at this point, do we know when the started production? I doubt it was as late as October, they set a target for the end of the year of 3million, that sounds like that's what they expected to be able to ship out to me. MS never gave a set number they expected to sell before the year ends so we'll see where it all ends up.