It's easiest to raise cockerels in a flock including mature hens, at least. Consider getting some straight run chicks next spring and raising some cockerels, so you have some to choose.
As far as breed differences are concerned, there are some very general trends to think about.
RIRS, the orange ones from hatcheries, are often not so nice. Salmon Favorelles tend to be very sweet. My white Chanteclers from Cackle have all been good. If only one rooster, one of the big game types would be a consideration, they tend to be okay with people.
Small children are difficult, because they tend to be too active, scream a lot, and are at face level to standard sized birds. This can be a bad combination and annoy many roosters...
No rooster can defend against serious predators! It's great to have them, but they will die too if a predator shows up.
Will you want to raise chicks? Then choose a breed that fits with your flock goals.
Mary