This surprises even me, but I'm going to say Sony.
Near the beginning of Nintendo, I thought "Nintendo is going to win this for sure". They went from strength to strength. The Zelda. The 3DS stuff. All of it. And then they got to the Wii U, and...well, it was disappointing. All we really saw was one tech demo, and everything revealed for it is multiplatform, except that god awful Lego game.
Sony got better in retrospect, and Nintendo has got worse.
I'm still watching Ubisoft, but I think I will give that the win overall, based on what I've seen so far.