One chick with a hen will probably do better than one chick alone in a brooder.
But if you have chicks of slightly different ages, then brooding them together is also an option to keep them from being alone. Up to a week difference in age is usually fine, one they're a few days or a week old they may be fine with chicks up to 2-3 weeks different in age.
But if you have chicks of slightly different ages, then brooding them together is also an option to keep them from being alone. Up to a week difference in age is usually fine, one they're a few days or a week old they may be fine with chicks up to 2-3 weeks different in age.