As you are asking about cuddly ducks, I am responding but assuming your ducks are pets like mine. I have a flock of pekin and muscovy drakes. One of the pekin drakes has a strong bond with one of the muscovy drakes. They do squabble in the spring but are fine out free ranging during the day. Over night the two pekin drakes sleep next to each other in medium duck crates in the coop, while the two muscovy drakes sleep outside the crates -- one a top a repurposed wall cabinet that is in the coop as a cold weather shelter.
My son has two pekin females and a muscovy female: they are close buddies and have even accepted a feral rooster hanging around in my son's back garden. The females are definitely less trouble than the drakes but only the female muscovy likes cuddles. Whereas with my drakes, one muscovy is a great lump of cuddly drake, both the pekins are calm and consent to petting but don't come looking for it, and the second drake does not like being petted but is really nosy and likes to know what I am doing all the time whether I am in the garden or in my house.
We have had no leg problems nor egg problems, but the pekin are all slim active ducks not excessively large. The female crested pekin can fly and delights in flying across the back yard to overtake the other two waddling ducks. [The muscovy has her wings clipped and so cannot fly]. My own crested pekin drake is a slim little guy quite as agile as his buddy muscovy, climbing up and down steps without hesitation.
I should add that the flocks are both blended -- not brought up together from little fluffy ducklings. The female muscovy was introduced to my son's ducks this year when they were all 9 months old. My flock are rescues and have been together for variable times. The bigger of the two pekins was the last one introduced 2 months ago when he and y original crested pekin were 12 months old and the muscovies were 9-10 months old