Atmosphere will be Kona for sure. If I were choosing dinner though I would go with The Wave because I like their dinner options better. Sure, the restaurant lacks theming but the most important thing to me is the food.
I do prefer Kona for lunch though. You get large portions at a better price.
My Dh and I ate at The Wave this past weekend, and it was very good. I would definately eat there again. We stopped by Kona a lunchtime one day, but I didn't like the menu so we didn't actually eat there.