Most people are going to look at screenshots and say which looks better (there is no such thing as a tie unless it's exactly the same image). The tablet isn't going to do Nintendo any favors in that regard, but that's their design choice and they are going to have to live with it.
Why cant a game basically ignore the tablet, or make a static image or something there and just concentrate on the main screen? Or maybe put a inventory or something non-demanding there I guess?
As bad as recent rumors sound about Wii U power, it might amount to spitting in a rainstorm, but hey.
I imagine at first Nintendo will mandate everybody do something unique with the tablet and blah blah all that jazz, but before long they might not be in a position to dictate much of anything.