Our family votes for Ohana! We have dined there several times, but decided in 2007, we would give it a rest for a couple of years and try some new places. I have missed it and plan on eating there after our cruise Feb. 2010.
This past March, we tried Boma. We were not impressed, but I am glad we gave it a try. DH did not like the more "exotic" flavors. We left kind of hungry, the lines were just too long to wait in, especially for our 5 and 2 year old. We did not have a great waiter, either....he was very hard to find. Also, this was the first time in all my trips to Disney that I had an anniversary notification for DH and I, and it was not acknowledged at all, not even a "happy anniversary".
Everyone is different...give them both a try if you can!