It's pretty clear why the PS4 is selling so much better.
Yup, Japan and mainland Europe don't like Xbox. Meanwhile, sales are quite evenly spread between the two in the USA and the UK. If exclusive games really made a notable difference, then Sony would have already steamrolled Microsoft everywhere on the planet.
Then again, you could say that Americans buy Xboxes due to patriotism, so that's why it's close there.