I have one CR rooster, and he was the runt of the chicks I had gotten. When he was new, I was afraid he would not make it due to his behavior: head down, eyes closed, lets other chicks run him over, very small...but he grew up to be a giant who is fiercely protective of my hens!
He escaped the run when one of my dogs went after an escaped hen, and fought until he couldn't. And even after that, he still challenges the dogs through the fence. He is very brave and I have never met another rooster like him. My neighbor has three herself and she says she has never had such tough, ready-to-go roosters before them. In fact, yesterday when I scared a hen by picking her up from behind, my roo ran in all fluffed up and kicked me in the knee! When I set her down, he stopped and herded her away with him.
If I ever need a rooster to protect future hens, I would consider a CR first.