I have to say the Pekin...
I have a crested pekin names Stella and she is the most outgoing of the 6 ducks I have. I have one runner named Ming Ming and she is sooooo skittish. I also have 4 Khaki Cambells and they are pretty friendly too but not as outgoing as Stella. My lone male duck Stripey, a KC, is pretty friendly but is a real big cry baby lol He's so cute though.