We went to all three of those restaurants last year.
Boma is an excellent buffet for unique and delicious foods and desserts. We absolutely loved that place, wished we had made more than one ADR there. Kids loved it too. There is a section of traditional kid favorites. The atmosphere is very beautiful as well, elegant surroundings, dark wood, very enjoyable to spend a evening dining and seeing the gorgeous lobby area, and walk around the animal viewing areas of AKL.
Sanaa has outstanding Indian food, which we love. And table service if you prefer that to a buffet. It is a little more out of the way to get to. Some of the tables are by the window and have a direct view of the animals. We did not have a window table, but the whole family enjoyed the meal. Our server told us they have also become a favorite of the locals. We would definitely go back to Sanaa.
Jiko is the most upscale. We thought it was only OK. The service was excellent. It was very expensive, portions were fancy and small, good, but not outstanding. My kids (10 and 8) did not enjoy it at all. I would return again, only without kids, though it would not be my top choice at WDW.