Hi, Les! Seafood is a huge favorite when my family goes out to eat, so we've made it a mission to hit all of the seafood restaurants at Walt Disney World.
The Cape May Cafe features a buffet meal that includes a variety of seafood dishes, other hot entree selections, soups, salads, and desserts. The meal for adults varies in price from about $40 - $60 (the price fluctuates based on peak season and peak weekend days).
Fulton's has an extensive seafood menu. You'll find everything from shrimp and grits to steamed Maine lobster. There are other options for non-seafood eaters, but you will definitely get a seafood dinner if you dine here.
If I was going to choose between the two, I would probably opt for Fulton's. I can't say for certain on any given night if the Cape May Cafe will have crab legs on the buffet, but I know for sure that if I have a craving for crab, I'll be able to order it at Fulton's.
Not to further confuse matters, but if you are looking for a really nice meal in a beautiful restaurant, check out
The Boathouse in Disney Springs (formerly Downtown Disney). The menu changes daily to reflect the freshest seafood and raw bar items, expertly prepared, with incredible service. It may be one of the best dining exepriences at Walt Disney World.
Good luck making this tough choice!