DL's House of Blues will have the same menu as WDW. However, the atmosphere at WDW is MUCH better. DL's has a much smaller dining area but they do have an outdoor patio that is open most of the time. WDW has the small stage inside the dining area that DL lacks which really adds to the atmosphere.
Personnally, I love the food (since its the same at both), but for atmosphere, WDW's beats DL's HOB.