Definately Concourse, you can hop onto the monorail and ride it around to Contemporary one last time and see the castle before leaving. Plus the food at Concourse is better than at PH...IMHO.
They have a greater variety of food than the concourse steakhouse does and it's an interesting place.
We just got back from the Contemporary and let me say, everyday at lunch time the Concourse steakhouse was dead - to me it would be like eating at a Mausoleum.