First the one that takes ressie is the one next Bongos on the West side. It's important to know that. That menu is fancier and more expensive. It's on the dining plan for the downstairs part. I'm not so sure about the upstairs. Upstairs more expensive, downstairs not as bad. I enjoy the food more downstairs then up.
The Wolfgang in the Marketplace is more of a quick service to me. But it also has a variety of typical food instead of tuna tartare for instance.
The Wolfgang in the Westside is the 2nd bus stop for DTD. Just an FYI. I had to walk clear across DTD to get to the WS and it was not fun with a newly replaced hip.