I think you should base your decision on your itinerary, not by the menu. If you were talking about lunch because you were planning to take an afternoon break from the park, I'd maybe give the nod to Cape May cafe. But if you are going to be touring the park both before and after dinner, why add another 20 minutes on either side of dinner for commuting to/from the Beach Club?
Plus, if you're visiting during a busy time of year, you'll get a great deal of satisfaction by walking up to the Prime Time Cafe and getting seated for dinner after a short wait while those poor souls who don't have ADRs will be turned away or told there's availability after 8pm.