I didn't like the Wikinews model for covering big stories last time I looked at it. Specifically, there is a strong tendency to write lots of little stories on updates and ignore the big picture. Also, when new information comes out which supercedes the old information, the old story doesn't get updated to reflect this new information.
I don't much care which domain name is used to get to the story, but I think the Wikipedia model of news story development is a refreshing change to the status quo. In other words, if Wikinews wants to allow story development to last for weeks or months for certain big stories, then I'd support redirecting the Wikipedia article there. But until it does so, Wikipedia offers something that is unavailable at Wikinews, and in fact is unavailable anywhere else on the Internet.