Hello,
For mommie2angels, I have stayed at AKL (2x) & Coronado (2x, soon to be 3x) , and also the Swan ( but not the Dolphin). All three have advantages.
The AKL is one of the most unique resorts in the country. While some may complain the rooms are dark, the theming and animals are outstanding. While you can get a standard room, it can't hurt to ask about an upgrade at checkin. My last time we had a standard, but they gave us a pool view upgrade. Even with a standard view, there are numerous places you can watch the animals, you just can't do it from your room. The rooms are larger than Coronado, but smaller than the other deluxes. There is a double sink also. All rooms have balconies, even standard view. The resort is somewhat isolated, but easily accesible by bus. If you drive, AK & MGM are close by, Epcot a few minutes more, and MK about 15 minutes.
Coronado is a bit fancier than the other 3 moderates in my opinion. The rooms are about 315 sq feet, and the vanity only has one sink. You can request rooms that are close to the main building, but even if you end up at other buildings, there are multiple bus stops. CS is close to AK, MGM, and Epcot, and about 10 minutes to MK by car. The lake is very nice, and I find the theming to be very nice. I'm staying there again next month.
The Dolphin has a great location, between Epcot & MGM via boat. You can also walk to the other Epcot resorts and the Boardwalk, although I don't know if that's an option for you guys. Our stay at the Swan was a king bed room, which was large, but I can't really comment on the Dolphin dbl bed rooms since I've never stayed at one.
All three are good choices, hope that helps.
Take care,
Bill