You can actually export a transparent model, directly in Slicer, using the script that I linked above. You can copy that image over content in Word, PowerPoint, etc. and the background will be visible wherever the view content is transparent.
You can also set the view background to white if you know that you’ll show the content over white background and then you don’t need to copy-paste a script.
There is no difference, they are both equally good for making a 3D object semi-transparent.