The deluxe savanna view rooms are larger than the regular savanna view rooms. The deluxe rooms slept five plus an under 3yr old in the crib and the regular savanna view rooms slept four plus an under 3yr old in the crib.
The other differance is that the deluxe rooms are all located on the 5th floor.
I would not pay the differance in price unless you are a party of five.