How about neither!
Japanese steakhouses is good food, but not unique to Disney in any way. In fact, last time (3 weeks ago) we had the worst "cook" I've ever seen.
Cape May has never intrequed me... just walking by it from the outside, it has never interested me. Maybe it's because I'm not a seafood lover and I'm from New England.
Why not try one of the more unique options for dining around Boardwalk or in Epcot - there are SOOO many to choose from!