No orange shades? :) I would think a little more about this, not only do they add some richness but they help read the flow of the lines.
I don't particularly like the version inscribed in the circle, but it might be a legitimate variation for some uses, e.g. an icon. In this case I suggest that the outermost space is no less thick than the lines.
The black outlined version is a no-no, imho 😅



