Vector Cop always traces your bitmap, carefully teasing out the underlying shapes in it, and provides you with a real vector image with all of its benefits.
In contrast, there are numerous services available online that claims to convert bitmaps into vectors, but that in reality just embed the pixels without actually tracing them into vector shapes.
This leaves you with a file that will still be blurry when scaled, and will not be usable for cutting, sewing, laser engraving, or other purposes that require a real vector.
Save yourself the frustration and go with Vector Cop for real vectorisation!