Depends mate, i think all have great qualities, i think as a service dog all four are excellent, as sport dogs the GSD would top my list, in my experience they track better than the others, are easier to control than a mail or Dutch Shepherd, the rottie can suffer in the agility sections. Aa a family protection dog the mali would be bottom of my list, not for a lack of drive or ability but they require a special handler.......
i would have to agree with you there but in a crisis situation i think i would prefer a dsd at my side
A good one from any of those breeds would be fine by me,