It really depends on what you're definition of "better" means. We have dined at both, been dining at CMC for years and always enjoy their breakfast. However Bon Voyage is quite a different experience. If characters aren't important then it really comes down to whether you want a buffet style breakfast or a made to order breakfast.
There is definitely going to be more options at CMC but it will be more of your traditional style items while Bon Voyage has fancier options (that can still be modified to your liking). Quite honestly if it was the just the food choice I'd go with CMC because of the variety (you can have a little of this and a little of that...) Don't get me wrong as we really enjoyed Bon Voyage but we spent a much longer time there last visit waiting on our entrees to be done properly. Just to add...even though you're not looking for a character experience (we are adults also), we totally enjoy the characters from BOTH establishments
Feel free to browse our photos from both meals-
CAPE MAY CAFE BREAKFAST BUFFET PHOTOS and
BON VOYAGE BREAKFAST PHOTOS & REVIEW