Your thought of the ruger blackhawk?

im thinking of getting a ruger blackhawk for home defense in either .357 magnum or .45 colt. i have a simiautomatic already but i dont keep it chmbered for reason of the lack of a manual safety. so i want a single action revolver so i can cock it with one hand and a single action eliminates the risk of the triger being pulled by accident. so down to the questions. what do u think of it? whats ur caaliber preference? .357 mag or .45 colt? for what reasons? what do u use it for?