Sony (in my opinion).
Nintendo was head and shoulders above the other two, but Sony's was better. The big difference between Sony and MS for me was how to presented their new motion controls. Sony presented a very balanced presentation with "core" and "casual" titles for move where as I don't think MS did that at all (Forza doesn't count if you consider what they were trying to push, a reskinned version of Joy Ride, that other natal racer).
Also, I think Sony's surprises were much bigger than MS, with the only thing notable (from what I remember today) was Metal Gear Rising, which was such a awesome shock, but that's it really (I guess the New Xbox was pretty cool, but a year too late in my opinion). Twisted Metal basically destroyed that alone, but if you include things like infamous (reveal of ice abilities was a pleasant surprise) and Sly cooper remastered (and that mascots game thing), Sony had just enough secrets to reveal. the only annoying thing about Sony's was that it had a few un-necessary things included (kevin butler), which i'm sure people who love the offensive approach sony's taking these days would have enjoyed, but I just thought it was a pointless cash in of a luckily successful commercial.
I'm not saying the MS conference was downright horrible, it's just that they clearly didn't plan it as well. Last year when they said "from this point onwards, everything you see will only be available on XBOX 360" I was amazed. This year, I was disappointed, because if this is all they could think of for what's coming exclusively to xbox in the next 12 months, they might be in trouble.
