While we recently discovered that AKV Kidanni maybe be our favorite resort (so far), I think that at least for our family and trip priorities, the savanah view is over-rated.
We did enjoy going out back before/after dinner, hanging out at the fire, etc when watching animals, but there really wasn't any time to do that from the room since we left in the morning (no animals out) and didn't return till night (some animals, but very dark).
If your trip often includes a lot of "room time" during the day and early evenings, I can see why a savanah view might be more desireable.