My first thought was that you are going to have to be really careful about the breeders you go to. Both the Rottie and GSD are very popular breeds and there are a lot of people out there trying to breed for money with no clue what they're really doing. What you end up with is a lot of Rotties and GSDs with very unsound temperament. Make sure you go to a good breeder, so that your dog is free of hereditary diseases and temperament issues. Socialisation from an early age is also key.
http://www.wonderpuppy.net/1breeding.php has a ton of useful information on how to pick a good breeder. I think Inga and Xeph (who are our resident Rottie and GSD experts, respectively) will be able to help you with finding a breeder in your area.
As long as you do that, you have nothing to worry about with either a Rottie or a GSD. Both make excellent dogs, wonderful companions, very solid when raised right with the proper amount of time and commitment they deserve. They are very high-drive dogs and need to be kept occupied and well-exercised in order to avoid becoming bored...boredom often results in them trying to amuse themselves (ie digging, barking, escaping, chewing). Exercise to a GSD or Rottie means at least an hour of walking twice a day... some will need more than that, especially in their prime years. Be sure that your wife can provide that.
I would also caution you not to rely on your dog for protection... YOU protect your dog, not the other way around. Just the sight of a Rottie or a GSD is enough to deter most criminals from trying anything funny, but if some idiot actually does attempt to break in or harm your family, you should never expect your dog to recognise or attack him unless it has been professionally trained in protection work or schutzhund. I cannot stress this enough. Get some sturdy locks, an alarm system, get a gun if you absolutely have to. Do not depend on your dog as a primary source of protection... firstly, for your dog's safety, but also because no dog that has not been professionally trained for the job is reliable enough. I know about 10 GSDs and Dobermans and out of those 10 dogs, I know 7 would turn tail and run if they were suddenly placed in a threatening situation. Not all dogs are instinctively protective. If someone breaks into your house, your dog MAY attack him... he may also just stand there barking while your wife tries to fend the baddie off, or he may run behind the couch. Unless you have professionally trained him to be a protection dog, there is no way to tell. Don't rely on your dog to defend you unless you have professionally trained him to do so.
Sorry for that spiel... one last note on the gender of the dog. No, actually male dogs tend to be a bit more goofy and, you know, "every stranger is a friend". I have no experience with male dogs but I have heard that they are a little more attention-seeking and velcro. Females are quite literally bitchier and tend to be slightly more reserved and aloof. (Though looking at my girls, you would never know...*rolls eyes*)
http://www.wonderpuppy.net/1breeding.php has a ton of useful information on how to pick a good breeder. I think Inga and Xeph (who are our resident Rottie and GSD experts, respectively) will be able to help you with finding a breeder in your area.
As long as you do that, you have nothing to worry about with either a Rottie or a GSD. Both make excellent dogs, wonderful companions, very solid when raised right with the proper amount of time and commitment they deserve. They are very high-drive dogs and need to be kept occupied and well-exercised in order to avoid becoming bored...boredom often results in them trying to amuse themselves (ie digging, barking, escaping, chewing). Exercise to a GSD or Rottie means at least an hour of walking twice a day... some will need more than that, especially in their prime years. Be sure that your wife can provide that.
I would also caution you not to rely on your dog for protection... YOU protect your dog, not the other way around. Just the sight of a Rottie or a GSD is enough to deter most criminals from trying anything funny, but if some idiot actually does attempt to break in or harm your family, you should never expect your dog to recognise or attack him unless it has been professionally trained in protection work or schutzhund. I cannot stress this enough. Get some sturdy locks, an alarm system, get a gun if you absolutely have to. Do not depend on your dog as a primary source of protection... firstly, for your dog's safety, but also because no dog that has not been professionally trained for the job is reliable enough. I know about 10 GSDs and Dobermans and out of those 10 dogs, I know 7 would turn tail and run if they were suddenly placed in a threatening situation. Not all dogs are instinctively protective. If someone breaks into your house, your dog MAY attack him... he may also just stand there barking while your wife tries to fend the baddie off, or he may run behind the couch. Unless you have professionally trained him to be a protection dog, there is no way to tell. Don't rely on your dog to defend you unless you have professionally trained him to do so.
Sorry for that spiel... one last note on the gender of the dog. No, actually male dogs tend to be a bit more goofy and, you know, "every stranger is a friend". I have no experience with male dogs but I have heard that they are a little more attention-seeking and velcro. Females are quite literally bitchier and tend to be slightly more reserved and aloof. (Though looking at my girls, you would never know...*rolls eyes*)