We love Kona for B,L and D. We have only tried Ohana for breakfast years ago.
But assuming you mean for dinner, I think you will get more bang for your buck with Kona. The price at Ohana already includes everything except alcohol and extra desserts. At Kona, you could order a great appetizer, entree and dessert for a higher total than the all inclusive price of Ohana.
Much better selection too.