I haven't had them myself but from my observation with friends' birds. Silkies are far and away the most calm and friendly.
Of the 30 breeds I've had, Jersey Giants were the only ones I could walk up to in the yard and pick up with no prior taming.
I've had black, white and blue.
Orpingtons are friendly too.
Silkies downside is they are often broody and with limited vision are very predator prone.
The EEs I've had weren't the most friendly but they did have a great personality if a bit standoffish.
I want to say that in a mixed flock, if your birds free range, the skittish birds are the least likely to get picked off by hawks and foxes.