Compared with cloud converters
Cloud converters upload your file, convert it on a server, and hold it for a period before deleting it. That is a reasonable design for transcoding a video. It is a poor one for artwork you have not published yet.
Where the file goes
Theirs is uploaded and stored for a retention window, commonly 24 hours. Ours never leaves the browser tab, so there is no retention window to think about.
What "SVG" means in the output
Several of these services produce an SVG that contains your original bitmap inside an <image> tag. It opens, it looks right, and it will not scale, cut or colour separate, because there is no path geometry in it. Ours traces real contours. You can check either one by opening the file and searching for "<image".
Machine formats
A general transcoder converts between picture formats. It has no concept of a work area, a cut depth or a feed rate, so a DXF from one usually arrives with no declared units. Ours writes $INSUNITS and flips the Y axis for CAD.
Breadth
This is where they win. Convertio publishes over eleven thousand conversion pairs, including audio and video, which we do not convert at all. If you need an MP4 turned into an MP3, use them.
Big files and slow connections
An upload has to finish before a cloud converter can start, and the result has to come back down. In the browser there is no transfer either way: a 20 MB scan is converted as fast as your own computer can do it, which on a slow or metered connection is usually much faster.
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.