Great post, from someone who has actually used all three. So many making passionate arguments for one or the other have only ever used one of these three, mostly JDQA and SSQA.I have used JDQA, Global (with a spring-loaded pin) and skid loader QA, and they are listed in my order of preference.
Watching videos on YouTube and reading posts by others who've used both, I see your comments echoed. Most seem to prefer JDQA, if they had their choice, but all agree it's not really that important which standard you get. Lots like to argue for the commonality of SSQA in borrowing implements from friends or neighbors, and I guess if you have a friend or neighbor with whom you'll be actually sharing implements (I've never seen that happen), you'd do well to just get whatever they're using.