Simply different type of markings to help you see what you're selecting. With the solid it's easier to see what segments you have selected. And with the wire you can see what's underneath should you need to refine it. Though I don't recall it ever switching between the two when you haven't toggled it manually through pressing F2.
Could be that one of the materials are dx-shaded and the other isn't, maybe, dunno?
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Could be that one of the materials are dx-shaded and the other isn't, maybe, dunno?