We ate at both late 2008. The wave was literally opened for about a month and nobody knew about it...nice and quiet!
I liked the Wave a lot, but loved Wolfgangs. Only problem is that its a bit out of the way. We only went because we had to check out on our last day and didnt have a flight until 6:30pm. We wasted time in DTD.
Either choice will be good. If you want to escape the World a little, choose Wolfgangs.