I have found it much less crowded than Beaches 'N Cream. I don't remember the ice cream at B'nC being anymore memorable than that of the Dolphin Fountain either. The servers are wonderful and they even managed to put on a birthday party for my 3yo DS last summer complete with balloons, cake, ice cream, etc. for 8 of us and made him feel very special. I also remember them being able to rustle up a couple of cold ones from the Dolphin bar upstairs to enjoy with dinner. Food is really good and it's open for lunch and dinner - usually open after we came back from the parks too for a milk shake or cone.
Our family definitely prefers Beaches & Cream. You can't beat their hamburgers and onion rings. I read somewhere that B&Cs hamburger is provided by the Yacht Club's Steak Restaurant--so it's actually ground sirloin. And you can't beat the theme!
We did have a good experience at the Dolphin Fountain, however, it's not on our list for our next visit in July/Aug. It just didn't compare.