Wolfgang Puck Cafe is a sit down restaurant. It is very good in my opinion.
WPE is counter service. There are two locations at DTD. One of them is a bit larger if I remember correctly with a larger menu. I like the one that is not on the end where Cirque du Soleil is. I can never remember the areas of DTD.
Wolfgang Puck's upstairs dining room is more upscale dining. I think the menu changes regularly. I have never eaten here but the menu always looks pretty good.