Best in what way in particular?
I have only had two roosters, and rather a lot of cockerels.
One is a Light Sussex, he is a real gentleman! I would trust him with children of any age, and he is also very good with his hens.
His downside is that he isn't very protective, and would be the first to run from a predator.
My other is a his son, so a light sussex x cuckoo orpington, and is still very polite, but I wouldn't trust him entirely with young kids, but he really keeps a very close eye on the hens.