When I worked in Germany they used to call adjustables 'Englanders'.....cheeky bstards.
Here in BE they also call them like that: "English key", literally translated from "Engelse sleutel".
Cheap(er) ones have a rather loose adjustable side, alot play, and need to be re-set to the needed gap, every other turn - they'fe an annoyance and a waste of time.
Bahco ones are totally different, looks and handling, once set, they handle like non adjustables.
With a bahco one you can tension a hard to reach nut in the dark, with those cheaper ones, well haha, you smack it on the bosses table and ask a real tool.