Having any dog of any breed (or mix) want to bite the owner’s face “off” means they are mentally ill, or severely abused. Nobody I know, has had either breed “turn on the owner”. Stop being a drama “QUEEN”.
I have watched several Rottweilers DRAG regular sized MEN towards another dog (resulting in a nasty dog fight) or even around a beginner class obedience ring – because they were too powerful – to be handled by that person. Any dog that can DRAG YOU off your feet, or places you did not intend to go – when they are a potentially dangerous, dog-aggressive & protective breed – means you can be overwhelmed and subsequently SUED (out of house & home) if you cannot control said dog.
I find far more Dobermans do BETTER (and score higher – as a rule) in obedience – than the majority of Rotties. I would much rather have a more reasonable-sized dog I COULD control, and that would be more willing to please, but that’s just me. However, I would not own either breed (even if free). BOTH have a TON of genetically passed on HEALTH problems.
The only absolute SAFE BET, is a wireless home security system. There are any number of protective breeds, but that does not mean any dog (from such a groups) WILL physically protect you – if not professionally trained – to stand up to an intruder. If all you need or want is an “alarm barker” that opens you up, to far more breeds, and a lot less likelihood of being sued, or having your home owner’s insurance……. JACK UP your rate$.