If you're staying at AKL, then of course Boma!
If you're at DAK and don't want to leave the park, Yak & Yeti.
I've enjoyed our two dinners at Boma greatly, but sometimes it's just a pain to go to another resort just to eat.
That being said, if you have never been to AKL, I'd say go, get there early so you can walk around a bit and take in the atmosphere. That's what we did first time, and just a couple months later I stayed there! I was sold.
Also, though, do you like buffets? Yes, they're a bit louder. You have to go get your food.
The food is really great at Boma, and they have things that you may have not tried before, plus a lot for folks that like plain food too.
I've actually never eaten at Yak & Yeti, but we do eat at the CS place every trip (DD and I like it).
Really it's apples and oranges, and depends on how you want to spend your time. Now that I've stayed at AKL 3 times and Kidani also once, I don't need to go back ever!