Here's something really interesting. As you can see in the images above, it appears that the Wii version of Rodea: The Sky Soldier is actually nicer looking on Wii than Wii U. The Wii version has more complex geometry and details. The colors are also quite different and the game actually loads faster on Wii!
Here's yet another comparison that shows off the difference between Wii and Wii U. What in the world is going on here?! Well, believe it or not, it seems the Wii U version is an up-port of the 3DS version. We hear the 3DS version doesn't run very well at all, but the Wii U gets the job done. That said, Rodea: The Sky Soldier was first in development for the Wii and the evidence above clearly shows that. Now we know why Yuji Naka has been so adamant about fans playing the Wii version!
We also have a look at some Wii version footage running on a Dolphin emulator. That way you get the HD visuals that the Wii can't provide, but we also get to see just what the Wii game would look like if it were up-ported to Wii U.