I prefer Kona. Service at 'Ohana can be hit or miss, and I didn't love the food. The meat was very dry, and we filled up on salad and bread, which was not worth the $$. Kona has very good quality, we loved everything, especially the desserts!
Kids are certainly welcomed at Kona, but at 'Ohana they're given free reign. Which may be another reason I didn't love 'Ohana! Lol.