What can you do with the Silhouette software that you can't do with the Brother? I use the web version on my pc to create my own files as well as manipulating any that I've downloaded. I get it all exactly as I want on the computer screen then save it as an SVG or else just send it straight to the Scanncut where it's then all ready to cut or draw.
Saving files as SVG is not on my version of Canvas, but then not tried it for a while, so presumably Brother have updated the downloadable version of Canvas. I found it very basic when I tried to use it. I will take a look and see if it can be updated.