Currently, my plan is to get the PS4. I've pre-ordered one. ...which is something of a shock to most of the people I know since I've been a huge XBox fan ever since the original console.
The bottom line was that there was a time when Microsoft seemed to believe they could do whatever they wanted with the XB1 and I'd buy it regardless. The fact is, I still almost did. However, there was then a slew of (what I feel were) snarky and [not sure I have a word fit for a public forum] comments made by the Microsoft team toward their customer base (which included me.) There were a few other things that happened as well, but that basically sums it up. Basically, in my opinion. Microsoft was making all of the mistakes that Sony made when they released Playstation 3, but then also treating their customers poorly on top of it. By the time Microsoft had changed their tune, I had already ordered a PS4... the first time I will have owned a Sony product since the days of the Playstation 1. With there seeming to be not all that much difference in specs between the two machines, I felt confident that I could express my disappointment by voting with my wallet and still end up with a good console.
I used to love Nintendo, but I don't even take the Wii U seriously. Since launch, there haven't been many games released for it. For some unknown reason, all of the big name games (i.e. Mario, Zelda) wont even begin to be released until December of this year. This is despite having a rather generous head start on the other two systems. On top of holding back on their own games, Nintendo has shown themselves to be uncooperative with third party publishers as well; so much so that some developers have decided to stop making games for the system. That doesn't bode well for Wii U. Nintendo used to have the edge when it came to kid games, and they still do to an extent, but I believe that edge will be minimal due to the extensive online networks that Microsoft and Sony have available; a lot of simpler games which would be akin to what Nintendo has to offer can be directly downloaded onto the consoles. In the case of Sony, there will be a robust amount of support for indy games at launch; many of the titles shown would be well suited for kids. I'm sure there are plenty of people who will still buy Wii U and be very happy with it, but -from my perspective- I don't believe the Wii U is currently worth it, and Nintendo is struggling to show me why the system would be worth the pricetage at a future time in which Sony and Microsoft have their newer systems available. Right now, Wii U isn't much more advanced beyond what the XBox 360 and Playstation 3 can do, yet it still carries a price tag which is barely cheaper than what the Playstation 4 will launch with.
I may eventually get the XB1, but I'm starting with a PS4.