While the Brown Derby is good dining, IMHO it doesn't come close to Artist Point. To be clear, we rate AP among the top 2 or 3 restaurants at WDW. Unfortunately, Brown Derby is much lower in our top ten, if we even think of it.
Why AP? Because its so unique. The menu has choices you just won't find elsewhere, the service is outstanding, the wine list is expansive and the atmosphere is wonderful. All in all, a great dining experience.