Well, I don't know. My personal bias would say Wii, but if nothing changes for PS3 beside the price, then I will say 50/50. They both have good chances of winning.
However, there are too many grey areas for this question. With that price change, there would obviously be a lot of other changes. For example, would the PS3 still be able to play BluRay. What would its graphic capability be? etc. To be off topic a bit, that's precisely why the argument of 'PS3 wins with no issue if it launched at [insert mass market price]' is considered bull.
If nothing changes beside the price, then chances are Sony would go bankrupt first before anything else.
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