Honestly, especially with the ages of your children, you can't go wrong with any of them. BC will get you super close to EP. BWI is slightly further from EP, but closer to the DHS walking path. Swan/Dolphin is the first stop on the boat coming from DHS and last stop on the way there, so that's convenient as well. They all have great pools (yes, we even like the clown slide at BWI!). BWI has great entertainment at night, but you can certainly walk there from any of the other resorts to enjoy the shows. Maybe look at some youtube videos and see which appeals to your family most!