I went to Game Stop last night to pay for Gran Tourismo 6 Anniversary Edition for the PS3. While there, I asked them about Xbox & PS4.
The girl behind the counter said there were ABSOLUTELY more PS4 pre-orders over Xbone, but they got more calls about Xbone stock then they did PS4. As a result, she assumes that the Xbox is in more demand than the PS4.
I kind of see where she's coming from, but I don't think it's a great representation. I asked her also, but just so I could comment about Xbox still being in stock (it wasn't). So dunno.