I think it's purely on what console you start off buying first.
Let's sum a little list up, shall we?
-The first console i had was SNES, that thing was awesome.
-Then i upgraded to a Gamecube (Luigi's mansion/Super Mario Sunshine = still best games, hands down.)
-A PS2 came after that (GTA was amazing when i discovered it)
-The Nintendo Wii (The motion tracking was REALLY bad for me though)
-And finally, the XBOX360 Elite.
Now, in some occasions i'd love a PS3 (The last of Us exclusive/no charges to online-play). But like, really, they both have their good and bad sides. It purely depends on what you get first. If you get an XBOX, most likely you'll diss the PS3, and the other way around too.
The point is : Get one of them/both, you can never get everything in life, even in stupid console wars this rule kicks in.
The Wii U? Don't get me wrong, but i found the Wii very annoying with the motion tracking, Smash Bros was fun though. But i'd rather stick with the Kinect (although you need ALOT of room for it).
I purely got the XBOX because "MOST" of the time they get games released earlier on their system. Also the look of the XBOX360 Elite made we go "wow, that thing must pack horsepower", because Elites were friggin' massive, it was like two Wii's stacked onto eachother!
XBOX got a slap in the face when "The Last of Us" was PS3 exclusive, just like "Halo" slapped PS3 in the face some years back. Just get a GameBoy Colours/Advanced, nobody going to fight over that.