Haven't tried Jiko yet. However, Boma is my favorite buffet-style restaurant on property. I highly recommend it. The cuisine is a bit unusual, but if you are willing to be a bit adventurous, you will be highly rewarded. I have heard wonderful things about Jiko, as well. I agree with simon that it is up to your taste in restaurants. Jiko no doubt caters more to the sophistocated palate (and wallet, which is why I unfortunately haven't gotten over there yet). If you prefer the gourmet experience (with tons of different great wines to choose from), then try Jiko. If you'd rather go somewhere where you can try a little of each of a lot of great foods, then go with Boma.