Compared with desktop tracing
Inkscape and Potrace are free, capable and local, which is most of what this tool claims. The difference is the amount of setup between you and a usable file.
Potrace
Excellent, and black and white only, driven from a command line. If your job is monochrome and you are comfortable in a terminal, it is a fine answer.
Inkscape Trace Bitmap
Powerful and free, with a dialog of settings that reward understanding and punish guessing. Ours presets those per route instead of exposing them.
Installation
Theirs needs one. Ours does not, which matters mainly on a machine you do not control, such as a shared shop computer.
Machine output
Inkscape exports DXF through an extension that varies by version and often loses the unit declaration. Ours writes it every time, and the checker will tell you if it is missing.
Colour artwork
Potrace traces one colour at a time. Inkscape can trace colours by stacking several scans, which leaves shapes piled on top of one another. Ours traces colour artwork into one layer per colour, which is the shape a multi-layer vinyl job or a screen print separation needs.
When to stay with Inkscape
If you will edit the paths afterwards - add lettering, combine the trace with other artwork, redraw a corner by hand - Inkscape is the better place to be, because the trace lands inside a full drawing program. Trace here for speed and machine output, then open the SVG in Inkscape if it needs work.
Try it on your own file
The only comparison that settles it is your artwork through both tools. Ours is free and needs no account.