Now that PS4 and X1 are both going to be $399, which will now sell better?

[SoftHimbeer]

Pretty easy

Xbox One will now be available to achieve a draw in the USA and UK
Still not enough cause its about how good you are global
The PS4 will be easily 20+ Million ahead at the end of the Gen.Xbox has no chance outside of the USA and UK to actually Win and even there they can only hope to achieve a draw or be slightly ahead.
Such a scenario like the 360 had in the USA won't come again.