I think pitbulls would be easier to defend yourself from as long as you aren’t in some open area with nothing to use. I remember seeing a video a while back of these Black fellows who were being attacked by a pack of those vicious hounds, and their solution was to grab a long piece of construction wood that was laying around, climb up upon an SUV, and just start clobbering the dogs from above with the two-by-four as their car was surrounded. It looked like it was a pretty effective strategy, too.