Hi eggsamilluon, I currently have two white campbells and one khaki Campbell. I've only had the khaki for a month and she is too young to lay at the moment but I've had the two white ones almost a year. I've never had ducks before so cannot compare to any other breed.
However I find that the campbells are all good natured, very friendly, get along really well and are so incredibly funny!! I get two eggs a day from the older white ducks, decent sized eggs which taste beautiful! They have never skipped a day laying eggs even through winter, although I expect them to stop when they molt. I guess I will get approx 300 eggs a year from each of them!
In terms of noise, I find that when I let the ducks out of their pen to free range on a morning they are quite loud for about 30 seconds. When I come home from work on an evening and go to see them, again they make a bit of a racket but I think this is like a dog who will bark when it greets you. My neighbours have reported that they don't make any noise during the day. They only other time they quack loudly is when a pigeon comes into the garden. They will try and scare it off.
I have a small pond in the garden that i empty and refill once a month. I also have a large cement mixing tub in their pen that gets cleaned once a week. Drinking water is essential and their drinking bowls get changed daily.
I would recommend more than one duck. I would personally go for a couple of females to start with and you can add more later. It isn't recommended to have just one duck with a drake as she will get overmated and it could kill her.
Apart from the mass quantity of poop (which I scoop up with a trowel and throw on the flower and veg beds) I don't have any regrets getting ducks. They are so funny and have very different personalities. The eggs taste X10 better than chicken eggs and I find their maintenance very low and easy. As long as they have food and water available and a secure bedtime house, I don't have any worries leaving them to free range all day. (Although I do have CCTV cameras at my house which I can connect to from my work computer to check up on them but that's just for fun really and because they cheer me up while I'm at work!)
I'll be happy to answer any more questions