The breed I've heard about people having problems with most is Rhode Island Red roos, at least with their not liking people. I've never raised RIRs (or had a roo, matter of fact) but when I looked into it, it seemed they were kind of infamous.
With it, though, seemed to come extra attention to predators and being territorial, and guarding a flock well. We have a friend who currently has a RIR who is pretty good, although when we were taking care of their farmette he seemed on edge with me. Needless to say, I didn't turn my back to him! They have gone through many RIR variations and have had to get rid of a lot of them because they were aggressive.
I have heard a lot of good things with bantam roos, tho. Good hen to male ratio - if you're into breeding, they can take care of a lot of hens. Their size makes them less dangerous to humans, they are kind to the girls, and mean with predators. My other friend has a bantam roo who you can pick up. Also they are light and won't squish anyone. Being smaller, they also eat less feed, which is a good thing because they don't lay! You have a good protector for cheaper.
Anyways, this isn't from first hand expirence, but this is my take on it.