First of all, I DO NOT own a WiiU. Which means this is a review of the 3DS version of Scribblenauts Unlimited.
Now, I'll start the review.

What's up, everybody? Today I'll be reviewing the 3DS version of Scribblenauts Unlimited! I'll start off by telling you about all of the differences between the WiiU version and the 3DS version that I know about. All I know is that the 3DS version lacks "guest objects" from non-5th Cell franchises and the Object Editor.
Okay, the game now has actual cutscenes and a storyline! I'll include as few spoilers as possible, by the way. (I've beaten the game.) The graphics aren't 100% traditional, but they've been greatly improved.
The game is now open world, which is a first in the Scribblenauts series. The downside to this is that there's no longer a Level Editor.
You no longer have the ability to play as other characters that you'll be used to, but in return... You can now play as Maxwell's parents (or grandparents, I can't remember) , brothers, and... His sister! You have to unlock them first, though.
Ollars are no longer existent, either.
That's all! Thanks for reading!