Since I have Disney Infinity on three major consoles, I'd thought I share what I find here in this thread, updating/replying as I go and fielding questions.
Firstly, the experience does vary, initial impression summarised as:
Wii U = Visually impressive, controls are a struggle, not natural and always "losing your place", flipping between "packs" is sketchy.
PS3 = Visually darker, much less impressive, however controls are much better, more natural and responsive, however game itself struggles when it's loading, cutscenes, popups etc.
Xbox 360 = Not played much yet, visually no complaints, hoping its the best bits of Wii U and PS3.
FAQ
Q. Can I swap Infinity Bases between platforms?
A. Not all of them, the Xbox 360 will only work on Xbox 360, and is the only Base the Xbox 360 will use, due to the Infineon USB security chip inside the Xbox 360. However the Wii U and PS3 bases can be swapped. The Xbox 360 Base has "for Xbox 360" written on the underside.
More here:
Infinity Platform compatibility
viewtopic.php?t=2920#p32847
Q. Why do you have it on three platforms?
A. I recently bought a Wii U Premium at a good price for the kids to play on the Gamepad and get the TV back lol, plus the handful of games due out for it soon. Xbox 360 is my platform of choice, find the experience and online abilities superior to PS3. However I also have a PS3 due to the excellent exclusive single player experiences, Infamous, Heavy Rain, Last of Us, etc. When it came to Infinity, I knew I should get it for Wii U and Xbox 360 to save arguments, for multi-platform games I love I also get on PS3 so I can play them again, get Trophies and Achievements and enjoy them again.
More coming soon...