I've eaten at both....DH will not go to Prime time...doesn't like anyone watching what he's eating/not eating....
Both have delicious food...atmosphere is opposite in these two places...one reminds me of being home w/mom & dad in the 50's...right down to the tables, aprons, hairdo's and the "you have to finish everything on your plate...there are people starving in (Europe, Asia, India, etc)"....O'hana's peaceful (noisy), that whole other world type of being....relaxed.
You need to visit both and come back and let us know what your preference is....everyone is on their own when it comes to restaurants and politics.....
Wherever you decide....enjoy!