I was pretty excited too, and I was even more surprised when I found out how much content it actually has for a handheld game. After playing it, I've thought about actually not buying the Wii U version.
I don't have a 3ds, so I am totally getting the Wii U version. Just so u know, Toys R Us is having an offer that if u preorder the Wii U version, you get free shipping and a free Amiibo.