Ohana, for the overall combination of the food and the theming/experience. Bonus points if you are there after dark and can watch the castle changing colors and maybe see the Water Pageant. Extra bonus points if you are there during Wishes and have a table with a good view.
Kona is good for the food but the atmosphere does not do too much for me. Too open to the hotel lobby.
WCC is just.....noisy. Their skillet platter is, to me, just average BBQ, and you can do just as well at several CS locations (Flame Tree, Cosmic Ray, Pepper Mkt). While Ohana also has periodic kids games and entertainment, WCC is a little too frenetic.