AKL seems to have a way of describing rooms that is unique to them. They have a standard view room (which is generally parking lot, etc) and a standard savannah view room (incontrast to deluxe savannah view, which is a slightly larger room on a higher floor and some have room for a 5th person on a day bed).
Savannah view is savannah view. Standard savannah view refers to the room size and that it only accomodates 4. We were on the 2nd floor, to be closer to the animals, and loved it. As with anything, it's possible to get a room that the animals don't seem to come as close to, or that has a near by tree, but most savannah view rooms have incredible views of the animals. A room on the Arusha savannah is great. If you expect to use the pool and/or food area a lot, ask to be near the pool.
We've stayed at most WDW resorts and WL has been our favorite since it opened (even bought into DVC at WL), but we'd stay at AKL in a heartbeat. Both are very special, relaxing places. We always go to the buffet at Boma and some trips we've been at AKL twice, even when not staying there.
Hope you have a great trip! Either choice sounds excellent to me.