Edge Detection Comparison

This is a comparison of my sub-pixel edge detection utilities, for octave which can save edges as an SVG drawing, to the ones from Inkscape. Not sure which is better. It may change for different images, but here is a simple example,
original image
from Inkscape
from my sub-pixel Canny edge detection extension
I'm not sure which is better. My detection was set for a 0.6 pixel line step, which gave a lot more datapoints than the Inkscape conversion. I am not an Inkscape expert, so I'd love to have some Inkscape experts try to do better, and tell me the settings they used for the conversion.

Here's a trickier one...
original from Inkscape sub-pixel Canny extension