This is a toss up for me. I feel the food at both is just OK. Both are kind of like buffets except they bring the food to you. If you are looking for good food there are probably better alternatives. The only buffet type restaurant that Ive been to there that had food i found truly enjoyable was Boma, and that is the best restaurant food ive had there, easily as good as signatures food wise.
Sorry I couldnt be of more help, I was just underwhelmed with ohana's and WC's food, the overall experience at both is good. If you look at the menu items you may find you are more partial to one than another, I found both to be prepared extremely averagely though.