I made tens of thousands edits in Wikidata, I understand the semantics of both switch icons, but every time when I need to change one of them, I have to hang out for a second to choose which one. It's very, very annoying.
This is because that they both look like a set of empty and filled rectangles.
I do not have good ideas what to do with the value switch, so I can offer only the idea for priority switch (this is just a draft, I think that there is no need to be tied to the pixel grid, and it is possible to draw it more nice).
Even if it will not look as nice as the squares, it will be exactly look more clear and accessibly.