I have 2 WH, 2 Khakis, and 2 Golden 300 hybrids that are all a little over 7 weeks old. They have been handled daily. I heard that the WH were calmer/friendlier than the Khakis, but I have not found that to be true. They all will come up to eat from my hand and will follow me around, but none want to be touched or picked up. They won't freak out if I pet them or pick them up, but they don't prefer it.
The Khakis are the friendliest of the bunch, followed closely by the hybrids, the WH coming in last. They have a baby pool, and the WH do not use it nearly as much as the others. They don't really seem to like the water all that much. They are always hanging outside the pool while the Khakis and hybrids are splashing about.
This is my first experience with ducks, and I thought they would be much friendlier if handled frequently as babies, but they get to a point where they will hang out NEAR you, but not WITH you.
Very cute and funny though, and I am enjoying them a great deal!