I've got: Penciled Indian Runners, White Indian Runners, Cayugas, Pekins, Call Ducks, Australian Spotted, Snowy Mallards, East Indies Ducks
My favorites are my Penciled Indian Runners and Call Ducks, although if I had raised the Cayugas I think they might also be a tie for 2nd place with the Call Ducks. The Indian Runners are the Thee Stooges of the duck world and you absolutely cannot stay in a bad mood watching them. They are great foragers. They don't have the problems with overmating that other breeds do, even though I have as many males as females. Mine are almost annoying friendly and would follow me everywhere if I let them.
The Call Ducks are also very friendly, considering I didn't raise them and they came to me completely unhandled. The white ones seem to be the most friendly.
My Cayugas are calm. They aren't super friendly but weren't raised by me and were bought from a show breeder. The poor females are so submissive that they get completely beaten up by the males if you don't give them vacations away from them.
My East Indies and Australian Spotted were not raised by me and are much more flighty, despite daily handling.
The Pekins eat so much and have so many health issues, I'd never keep them if I wasn't breeding to show. A pair easily eats as much as 10 Indian Runner Ducks!