We make RFC a part of every trip, but have to go with AK location. The only time we ate at DTD it left a bad impression on us - I honestly don't recall why as it was about 8 years back.
The AK location makes for a nice break from the heat of the park. We love browsing the store and have never gone wrong with ordering the basic burger or pasta there.
We'll also do AK RFC for breakfast every so often - DS loves their version of Tonga Toast. It's not at all like that you'll find at Kona Cafe, but that's fine with him as he's not a fan fo bananas and RFC's version doesn't put them inside the toast.