No Savannah view from Boma, but it might be a little easier with the kids. I've eaten at Saana once and Boma 3 times and I prefer the food at Boma. Saana wasn't bad at all, but with little ones, I think a buffet is easier and there are a lot of choices at Boma. I have 2 kids and the first time we went to Boma, they were 5 1/2. Both of them loved it.
Also, please be aware of other diners if you do eat at Saana. My dh and I were there for our anniversary dinner without our kids and we were seated next to a window. 2 little girls from a neighboring table (without a view) spent most of their time camped out right next to us because we had a better view. It didn't bother us too much, but some adult only tables might not be pleased.