For me this is easy, Ohana is our favorite place to eat and Boma we hated!!
DH and I can find anything on a buffet to eat, even if it is just the carving station. LOL But with Boma all the hype led me to believe that it was fabulous. Everyone said but it is "spicey". Now we love spicey, but I learned people have a different opinion on what is spicey.
Boma uses plenty of spices, but they are all sweet in nature. Cinnamon, vanilla and fruit flavors are in EVERYTHING. The meats were rubbed with it, the side dishes, even the soups were sweet. Believe me, I like sweet, but not for my dinner. Felt like we were eating a holiday dessert for dinner. For us it was gross. The food was good, but not for us. So when people say it is spicey, don't think hot and peppery....think cinnamon.
Ohana now is the bomb in our line up every trip. It suits us as we are both meat eaters. The sides are great, the sauces add enough "different" taste experience to enhance the meal. And the dessert...well heaven should be it's name.
I am a chocolate person, but there is no better dessert on WDW property than that bread pudding with banana fosters caramel sauce!! Oh just thinking about it makes me drool.
So there is our experiences. Take them for what they are worth.
Enjoy your trip!!