If you want a "signature" experience, then Jiko is good- DH lists it as his favorite. It was good for sure!
I like to try lots of new foods, new flavors and textures, so I am looking forward to trying Boma on our next trip and am glad not to have to spend 2 TS credits to eat there. If we were going deluxe, then we'd definitely go back to Jiko, but on basic dining, we are thrilled to try Boma.
They're really completely different restaurants. Jiko is fancy, fine dining, very upscale. Boma is a buffet, very fun, very casual, very loud. They're both great, but they're not at all the same.
Jiko. A Disney signature restaurant. Focus on quality food and service more than most of the other table service restaurants. It a casual fine dining experience...3-4 star restaurant.