Ubisoft games on the PS4 sold much better than on Xbox One. Sales on the PS4 made up 36 percent of Ubisoft's revenue, more than double the One's 17 percent. It's interesting to note that PS4 revenue also more than doubled sales on PC, which came in at 14 percent of total sales.
I don't know if these sales are reflected in other 3rd party publisher figures but it illustrates why PS4 is getting so much love from them. Pretty impressive really, especially that it beat out PC sales (arrrr me mateys!).