Personally, I think the main strength for the Wii is its versatile controller, but its weakness is processing power. If I look at a game like Super Rub-a-Dub on the PS3, you have the combination of motion control, a nice physics based water simulation, and a very simple game paradigm, and it makes for a very compelling game. The Wii can do something similar, with a game like Mercury, but it will be much more limited than what a PS3 version of the same game could be.
By which I am meaning to say, that eventually it will be eaiser to make a simple and fun, yet 'new' game on the PS3.
Outside of the obvious financial reasons the choice between Wii and PS3 for a developer comes down to the following. Do you want to make your game on a system with good processing power but limited motion sensing ability. Or on a system with good motion sensing ability but limited processing power. The example you gave for a game on PS3 that could not be done quite the same on Wii because of processing power could be mirrored by an example of a game on Wii that could not be done on PS3 due to its limited motion sensing.
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