I would choose the wii because it still has heaps of potential and with the thousand controller combinations lots of games would work on it. It might even come down to personal preference as a game developer though. its interesting to see how wiiware will work out.
In regards to the original question tho, I assume he was talking about a game that is already finished, right?
I agree with people's sentiments that Nintendo's offering has a lot of potential, but I'm taking it with a huge grain of salt until there's some actual content available