I believe you only get black sex-links if the female is barred and male is solid. I had a barred rooster and all of his offspring had headspots, both males & females.
Since there are no bossy breeds in that group, I would get a variety! Faverolles tend to be timid, so if you get 2 of a breed I would make sure to get two of those. Although I have a Faverolle and she is besties with my Sussex who is also super docile and sweet!
If you end up getting them the...
There are some more assertive & some more docile in general. Rhode Island Reds tend to be more assertive. There are a ton of docile breeds.
Do you know what breeds you will be choosing from?