We've been to both during busy times. We had excellent service at both. In fact, we arrived earlier than our reservation time to Ohanas by almost 30 min. (had planned for 15 min. before our reservation time, but got there even earlier because we over estimated the time it would take to leave the park and transfer there) and was seated w/in 5 min. of arriving. We got seated at 5:05 when our reservation wasn't until 5:30. While the service was great at both, the food and atmosphere by far was much better at Ohanas. The food we had at Konas was good, but Ohanas is another story--absolutely delicious. Also, the atmosphere isn't that great at Konas. Ohanas has a much funner dining experience too--especially for kids. They had cocunut broom races for the kids, they taught them how to dance to Hawaiian music, gave them leis, etc. I would definitely keep your Ohanas reservation.