We just returned from a week at the Swan--we chose it over the Dolphin because of the beds.We had major problems with housekeeping and the rooms did have a mildew smell-running the AC helped.I do not know if the housekeeping staff is interchangeable at these properties-if so, than I guess it would not matter which you chose.If you are going anytime soon,the pools will not be a factor--it was just too cold to consider swimming anyway.
We ate at both properties-things were fine.Both hotels seemed dated,but they were painting while we were there-perhaps they will improve after renovations.
Walking to Epcot is much faster than the transportation options.MGM is also walkable,but a long one.
You really cannot go wrong since you won this trip--congrats!
I would return to either of these hotels-they are still better than staying offsite and their location within Disney is excellent.
We have stayed at Disney hotels also,but the Swan and Dolphin are a much better value for the money.
Have fun