Pit Bulls are my favorite breed and I do know it is in their nature to be dog-aggressive.. BUT.. I do also think that how you raise them can make them less dog-aggressive.

For example, my dog Simba. A GSD/Pit mix.
When we first got him not one dog could walk into or near our home. 6 years later, he now lives peacefully with 2 other dogs and accepts visitors into our home.