Agree, have a 12 lb and 70 lb dog, if the behavior was the same, I have a better chance with the 12 lb. My 70 lb is a boxer mix and chill. My DD has a 50 lb Lab mix. I am sure there is pit in him but tell her to never say out loud due to restrictions. He is a doofy silly dog that I have no fear of BUT his jaw and teeth are machines compared to my boxer. That is the pit in him. If he were to exhibit the same exact behavior of the others, the damage would be bad.
He was at my house, ran in garage where one of DS basketballs were on the floor. He ran to pick it up to play and in one second his teeth punctured the ball. He wasn't even trying. Needless to say I sent ball home with him as DD has to keep him happy with lots of balls and very hard chew toys.
All data and statistics support that something like 60% of severe and mortal dog attacks are committed by pit bulls and a couple others. No one is saying because they are naturally bad. But I do think all dogs have a natural behavior. My 12 lb is a rat terrier, raised as an indoor dog, but let him outside and he will "hunt" for hours, has killed squirrels, chipmunks and rabbits (much to my dismay). But that is his breed and instinct. I believe pit bulls are used for fighting because of something in their nature that makes them good at it. We never know when a dog might get upset, so if we say all three of ours get upset for same reason at same level ... I assure you the one with pit in him will do much more damage.
Great Danes? WOW, that surprises me. I have known several, the most chill, gentle laid back dogs, almost to point of being comical due to their size. When my DD was baby she would lay up against a friends for hours and dog would act like her babysitter.
If it weren't for their size, I would have one for their behavior.