Ohana is a fixed menu. No one orders, food is brought to your table in courses. If you want more of anything, just ask. Go look at the menu and see if those are things your family would like. Ohana is a nice place to see and hear the fireworks at the Magic Kingdom if your table is in view. It also has the very best dessert in all of WDW...
Boma is amazing. The smell alone will entice you. As different as many of the foods are, there are some great foods that are also familiar. Kids will love the Zebra Dome desserts. The meats are fabulous, and the soup and salad selections are unique and incredibly flavorful. They are not too spicy, even though they may smell like it. It's like a buffet, so if you get something you don't like, you can always go get something else. The selections change daily, Monday and Thursday are the same, Tuesday and Friday are the same, Wednesday and Saturday are the same, and Sunday is Chef's choice.
Hard choice between the 2. Good luck!