The dogs personality, not gender, determines whether or not it would be good at gaurding your home. If you are picking out a puppy, I would suggest getting one of the middle range temperment pups of the litter. You want a pup that is not scared of you and the others dogs, but you also don't want one that is overly aggressive.

Just wondering . . . What kind of "home protection" are you looking for? If you just want a dog that will alert you, by barking, when someone is outside, almost any dog will do that. If you are looking for a dog that will completely keep intruders out of the house, you may need a different type of dog, plus lots of doggy training. My family has always had golden retievers and lab-mixes. One of the dogs even had a abusive past. All of them (boys and girls) were great family dogs, and would lick anyone that came into our house. They would all also warn us of anyone outside, and were trained to get in between us and an attacker, if need be. It is best if you pinpoint what personality traits, protection and otherwise, you and your family desire, before you go out and get that dog.