My Pekins were from TSC. I feel like they have a ton of issues partly because they tend to be the ones you find are TSC and other feed stores. So they end up being people's first ducks. No matter how much you research to prepare for ducks, you are never truly prepared for them. Pekins have a steeper learning curve. They need more naicin. I never see mine dunk her head in water except when she swims. I had the same problem with mine as ducklings and needed to give them baths to keep nares and eyes clean. There is just a lot more to learn with Pekin
I will say Muscovy are delicious. The males are huge, but they are pure muscle. I so far have had only one minor issue with my Muscovy. My drake had an inflamed penis and issues keeping it in, which was really unfortunate for him. One of my female Muscovy grabbed it one time and pulled. We seperated him after that. She still tried to grab it when he would mate the other females. He eventually ended up on the table. I have contemplated getting some ducklings and hoping for drakes. Keep the drake I like for breeding and eat the others. But they can potentially live up to 20 years.But if keeping my original flock is going to be this difficult, maybe Muscovy would be a better choice.