There is a categorical difference between the two. While dachsunds may have a propensity for violence, it is verging on comical to compare them to a German Shepherd, just because of the comparative physical capability of the dogs. A dachsund could get it in its head to attack me for days and I would never require anything more than a bandaid, while a German Shepherd could seriously injure me even were I trying to defend myself.

As I've said elsewhere on this thread, the first-order consideration for breeds is just the physical capability; temperament and training are second-order considerations that may mitigate some of the capabilities, but rarely will increase the danger of a breed.