Both of them will do well but you need to tame them. Almost any breed of mallard derived duck will have the same friendly attitude once they are tamed. My tamest ducks were all Muscovies, the only ducks that would come over by me to hang out even if I didn't have treats for them. Mallard derived ducks will do the same from what I understand but I have never owned one that tame. I currently have 1 Pekin drake, he will be 7 this spring according to the person who gave him to me. I have only owned him for 3 years now. I had several rouens before but only have one right now. They all became friendly faster than the Pekin but I do not know what his paste experiences were with humans because I got him as a mature drake, I got all the rouens as ducklings. I have gotten all my Muscovies, except for one that I hatched, as adults. The friendliest one was a mature hen that a moving neighbor gave me, she was very skittish at first but quickly became tame and was as friendly as a dog. Unfortunately she got killed by a dog several years ago. This is just my experience with a few birds though, I have only ever owned 4 rouens and 1 pekin so the breeds should definitely not be judged off of the attitudes of just 5 birds.
