Wow, that is like picking between apples and oranges. Both are great and entirely different!
If you can get to both, try! Narcoosees has fabulous steaks and lobster, not to mention a more quaint feel to it.
'Ohana is more festive and family oriented with the all you can eat shrimp, turkey, pork and beef and games for kids.
Narcoosees has a great view of the MK. 'Ohana does too, if you are seated near a window, but many of the tables are not near the windows.