d21lewis on 06 March 2014
Hey, OP--I could google it but I'm lazy. I know that when I did mine, both consoles had to be online and a bunch of Pikmin carried all of my content from the Wii and left it at the Wii U. There's really no boost in performance going to the Wii U that I'm aware of. It even keeps the same 480p resolution.
What I do know is, before the transfer begins, they explain to you what will transfer over and what will not and that the transfer is permanent. Give it a try and if you don't like what you read, just back out before the transfer begins.
Or look it up on youtube.
