Good Morning...we many a fun evening in both places...and the are really very fun, very good, and very very different..
Cape May...warm pastel colors...quiet atmosphere
Bier........huge dark German style open area that makes you feel like you are sitting outdoors with a big outdoor stage and dance area as the center piece. Very loud, a umpaa umpaa band every hour. You probably will sit with other guests at a big table for 10.
Cape May...buffet in the middle of the room, private booths or table, buffet features fresh steamed clams and mussels and lots and lots of very good food including some of the best BBQ ribs at Disney and wonderful salad selections...not a huge dessert selection but good.
Bier...Buffet way in the back and German food all the way...Pork, Beef, Weiner Snitzel, sour kraut, usually one fish dish, gravy, sausage, nice salads.
These would be two totally different dining experiences...not like "which steak is best" or which "breakfast is best."
enjoy...either will be fun...Ted