Truthfully, neither is my first choice. I like Peet's or Caribou for chains, but my favorites are the small local roasters in my area. I love a strong, dark roast and to me a lot of restaurant coffee tastes more like someone waved a brown crayon through some water. So I don't mind the "burnt" taste in Starbucks, but if I'm just trying to get a coffee fix I'll go to the place with the shorter line, which at WDW is Joffrey's. Joffrey's tastes a bit thin and old to me, but it's coffee, so I cope.
But oh, that first cup when I get back home and get back to the local coffee place! That is heaven.