Could be I've been taken in by AKC "propaganda" for the last 35 or so years. AmStaff people I talked to at shows are my primary source of that post. If it is wrong, then I'm sorry.
I was in Shelties, so about the only contact I had with pits was my foot to the jaws of a loose one when riding a bike; and when "taking care of" a couple trespassing ones literally pulling one of my barn cats in half.
Just reading the two Standards, it is hard to make a real comparison, due to differences in language style, comparable descriptives, and emphasized points.
Just one example, UKC gives a broad range of acceptable weights; AKC gives heights.
I also notice that AKC is still using a 1936 approved Standard, but UKC's was revised late last year. I've been out of breeding & showing for about 15 years.
They are both good dogs - "pitbull" hysteria is media generated fear and teh dogs look like powerfll little "bulls" so the fear is understandable . I am afraid of agrresive dogs myself - most APBT I come across are not particullary aggresive to people - OTOH I have come across many german shepards & rotties that are super aggresive.