As abrianna said. Pre-owned is best if you want a rooster, because you'll know his temperament. And you want to know temperament. You don't want to stick a teenage butthead into your flock; he'll hassle your hens and be a problem. And that's if he doesn't decide he's the boss of everything and you're a target.
A quality, mature rooster (of at least a year in age) is one of the best things that can happen to a flock. He'll break up fights and call the girls to food. He'll at least crow for danger (remember, many won't, which is why you need to be selective) and the very best roosters will fight off predators. Or at least give the hens time to get away while they provide the meal
Also, they're beautiful.
If you can find a good game rooster, I recommend wholeheartedly.
A quality, mature rooster (of at least a year in age) is one of the best things that can happen to a flock. He'll break up fights and call the girls to food. He'll at least crow for danger (remember, many won't, which is why you need to be selective) and the very best roosters will fight off predators. Or at least give the hens time to get away while they provide the meal

Also, they're beautiful.
If you can find a good game rooster, I recommend wholeheartedly.