neither of my 2 pits have ever even SNAPPED at a human let alone actually bit.
my lab on the other hand (raised in the same home since he was a pup) has snapped at me, my son (put a scratch on him that made my wife and i a bit jumpy), my father, and even at almost 9 years old now the vet just last month.
......but pits are "vicious marauders".
for the umpteenth time, go to ANY neutral website and/or talk to your local vets and groomers. they will all tell you the same thing.
search by breed. reliabilty with strangers. reliability with children.