Boma and Jiko are 2 of my favorites. It is hard to compare them as Boma is a very busy, very popular buffet and Jiko is a quiet sit down. If you like fine dining - you will love Jiko. Everyone I know loves it. The filet over Mac and Cheese is a combo you wouldn't expect to work, yet its fabulous. They also have lots of interesting salads and appetizers. Service is excellent as well. I'm told they have a very extensive wine list too (not a big wine drinker so can't help you there).
Boma is great too. Menu changes from night to night but they always have some of the same items including prime rib, chicken and salmon. Every night they have 4 or 5 different soups which are all excellent. Selections for the kids are the standard chicken fingers, mac and cheese, pasta.
It's a tough choice (food wise)- I think with kids I might stick with Boma though.