I say "go for it" and switch! I LOVE Kona and I would definitely say it is as good as Ohana, but in a different way. It's comparing apples to oranges. The quality of food at Kona is good, better than Ohana IMO, but of course you have a more laid back atmosphere.
If you've never done Kona before though, I would definitely say give it a try and just do Ohana once.