Mine love to be handled at all ages. Chicks will hop on top of waterers etc doing the me first me first when the lid is lifted on the brooder. My cock bird will run up if i sit in a chair and hop on my lap to be"petted" and wants to be the helper and see what i am doing all the time. I think a lot depends on if people raised or broody raised, ie who they believe is Mama. I would agree with jajeanpierre that double copy or frazzle birds would not like to be held because they have feather pain issues.
There are some slight differences in Pekins and Cochins that serious breeders would be able to detail out (that would not be me), however they are from similar background but called Pekin in Europe and Australia, but to all of us regular joe chicken lovers they are pretty much the same.
I like Pekins more for some odd reason