Very tough, but I chose Fantasyland in Disneyland. The reason being is that it hasn't gotten watered down like WDW's. Yeah I know I haven't seen the new expansion, but in Disneyland there are all the classic dark rides that they've maintained. It has a nice "feel" to it, and I love the simplicity of it. Just a lot more bang for your buck there.
My second is New Orleans Square. It has a scene to it that feels like the town itself.
Love WDW's Frontierland after that, and both Main Streets are worth noting.