if you go back to around 2007/2008 you will find a whole series of threads on TG about using bitmap tracers, often relating to the creation of vector for the dreaded spinning logos in xara3D, and the subject of which was best between xara and inscape was thrashed to death
I use tracers a lot - the default settings on inscape/potrace make it easier to get a smooth egde than do the default settings in xara.. but smooth edges mean the edge deviates from it's original path more than if the edges are jagged with xara
look at the attached file - I have highlighted where your inkscape trace has simplified the outline - I have also traced in xara and you will see how the outline follows the original more closely - I have also included the xara tracer settings that I used in the xar file
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