It's now late in 2015, and the Wii U has comfortably supplanted the Wii as Nintendo's flagship console. While there have been a few Wii releases the past couple of years, most of them are just low-quality ports of titles that are much better on other platforms along with the typical shovelware. But Rodea: The Sky Soldier is very different story. It is a high quality third party release for the Wii. In 2015. This would be a neat, but not exactly newsworthy story, except there is no Wii version you can buy on its own; it's only found as a pack-in with the Wii U release within the first print of the game. Now, most people are probably wondering, 'Why would I play the Wii version instead of the Wii U version?'
Because Yuji Naka, the legendary developer behind Nights into Dreams and the creator of Rodea, asked people to play the Wii version.
Rodea the sky soldier will be released today in North America! ! Please play the Wii version.
— Yuji Naka / 中　裕司 (@nakayuji) November 10, 2015
To sum it all up, the Wii U version is based on the 3DS version, instead of the original Wii version. The Wii version is better on every aspect of the game, including graphics.

Rodea The Sky Soldier [SROENS] (Wii NTSC-U).wia