Lucy, I stayed at the Dolphin 4 times before trying the Swan in April, and I liked the Swan very much.
SWAN
1. The bus picks-up and drops-off at the Swan before the Dolphin
2. The Swan has 2 queen beds vs. 2 doubles at the Dolphin
3. The Swan has 2 bathroom sinks (one inside/one outside the bathroom) - which is very helpful with more than one person in the room
4. The Swan is closer to the Boardwalk, for all those nights you drag your body back after hours at Jellyrolls!

5. The Swan is half the size of the Dolphin - so it's less of a hike to your room
DOLPHIN
1. The Dolphin has a lobby that makes you say, "WOW!"
2. The laundromat/game room/Tubbi's Buffeteria are at the Dolphin
3. The pools are a bit closer to the Dolphin
4. The Dolphin is more kid-appealing - IMHO (probably doesn't matter to you!)
5. The best views are from the Dolphin
There - do you feel better about staying at the Swan?