I have a White Campbell and a Runner...both extremely friendly, docile and stupid ducks.
The Campbell is 1 egg a day...everyday before 7am! Can't stop her laying.
They can both be a little skittish now and again when something, or someone, startles them...but on the whole they are fine, except when I am gardening or digging a hole as they very soon turn into annoying worm hunting ducks...GET OUT OF THE WAY!!! They haven't got any concept of physics and therefore don't know what happens when spade meets duck...fingers crossed they never will.
Personally I feel that it comes down to what kind of duck you like the look of...then lots of tlc, and treats, and within no time at all you'll have a friendly pet.
Woka