Instopped caring who was more powerful with Xbox 360 and PS3 and the difference becomes more irrelevant with each new gen as far as I am concerned. Everything looks amazing to me.
Here is a different prediction: without knowing anything else about them, I believe PlayStation will be the clear sales winner. I don’t think Microsoft cares anymore, hence almost all their exclusive games appearing on PC also, and hence a lot of rumours of MS partnering with Nintendo and Sony in Unprecedented ways. Xbox was a strategic move to keep Sony from creating a “living room pc”; tablets have killed the potential for that market, and now Microsoft’s biggest fight is on the cloud front against Amazon and Google.