Well, for one night, I would go with concierge over savannah view (though you could get a savannah view concierge room - but the view of the Sunset Savannah right now is not great).
If I were staying at AKV for a week, I'd want the savannah view. With only one night, I don't think you'll get as much out of it, and you can always go to one of the public viewing locations around the resort to see animals.
The concierge food services are very good. We had a bit of spotty service otherwise when we stayed in a concierge studio savannah view in early May, but we hope they're still just working out the kinks.