the Johnson is a bigger, heavier, huskier type look to the dog. a little more fierce lo0king.
the Scott is a little lighter and more athletic looking. the Scott seems to have a little more history on fighting other dogs. while not as big as the Johnson, the Scott appears to be a better, more agile fighting dog.
That is one of my considerations. these days there seems to be more and more loose dogs. while I love Pits, these days, there seems to be an epidemic of pits that have been abandoned by owners and running loose. I have actually seen a couple of packs of dogs not far from where I live.
I can handle a human who wants to break into my house, but i want a dog who can handle any 4 legged creature.