Deluxes are bigger and I believe they are on the upper floors of the hotel.
I stayed in a standard savannah about 1 1/2 years ago and we loved it (just me and BF). If you've ever stayed at WL, it's a similar sized room. We had a room on the third floor, which is the same level as the lobby, and we found that to be pretty convenient, although we were almost at the very end. However, we didn't mind being at the end because it gave us a chance to look thru all the viewing windows on the way to our room to see the animals.
I was there in Oct. 2004 and had a code rate of about $155 (nearly 1/2 off the rack rate). April might be a busier time though.