I would do O'Hana with that group, even though we've been to both and really enjoyed both. The "antics" at WCC are fun, but O'Hana is a bit more predictable (less dependent on the server), and more interactive (the limbo, pushing the coconut w/ a broom races, hula hoops, etc.) We enjoyed the food at both places, but none of the food was gourmet. Just decent food and lots of meat. The Banana Bread Pudding for dessert at O'Hana is the best dessert on property IMHO (and DW's opinion, also). Usually I'd go for something chocolate, but that dessert was amazing.
Plus, the view at O'Hana is better if you are by the window. Make sure you request to be in the main dining area. Otherwise, you miss most of the show.
We allowed each of our kids to choose a meal for our upcoming trip. DS3 chose Chef Mickeys, and DD6 chose O'Hana even though we haven't been there in 2 years. It's her first year not choosing a Princess Character Meal.