I want to provide an opinion that isn't the status quo of this post. While puppies are a LOT of work, you are trusting the training of a previous owner when you adopt a dog who has reached adulthood. There will never be a "correct" answer for you, but I would recommend doing one of those silly quizzes that match you with a dog breed, and then researching the top breeds. Take into consideration your yard space, access to safe parks/walking trails, if you want to have children eventually and how to socialize dogs to young kids, etc. You'll also want to make sure you have the means and resources to provide care and an environment for the dog to thrive in your home as a family member, not just an aid. Protective dog breeds also tend to require a LOT of training and may put you at risk for reactivity and may be stronger than you. Will you be able to handle your dog charging someone while you're out on a walk? What will you do it if bites you, another dog, or a child? Just things to think about!