The Wave - It's is very Non-Disney inside though so if you are looking for the Disney feel, this place isn't really it. However, the food is really good.
The Plaza - you can't go wrong. It's basic food and it's in the park. It's a go to when I don't know where to go to. lol
I have not been to DH but the reviews I've read have not been favorable. I personally would avoid just based on that. Sounds like they still have kinks to work out there.