I almost always walk from the Swan to Epcot (~ 10 minutes). I sometimes walk to Hollywood Studios from the Swan (~ 20 minutes), and have even walked from Epcot to the Studies a few times (~ 30 minutes). I need the exercise!
I find the boat from the Swan/Dolphin to Epcot to be S L O W, but it isn't bad going to the Studios as there are no other stops. At the end of the day, I will almost always walk from the Studios rather than wait for 1 or 2 boats to come, because the lines for the boat are long.
The bus to MK and AK almost always picks up at the Swan before the Dolphin, but the Boardwalk pick-up is first.
I prefer the smaller size of the Swan to the Dolphin, as well as the Swan's closer proximity to the Boardwalk. I like having a sink inside the bathroom as well as outside - which is convenient when there are 2 or more people in the room.