I venture to suggest that that's not strictly true.
As I understand it, they are both bog standard ADS-B receivers, and as such do exactly the same thing. (Although now the SBS has integrated networking capability).
The significant difference is in the bundled and integrated software supplied as part of the RadarBox package, which probably gives it the edge in terms of simplicity of use. That's not to say that the purists don't want bespoke custom software for their receiver - many of them do.
I'm sure most users make their respective purchases having done considerable research into the pros and cons of each, and are generally happy in their selection.
Some, however, have jumped both ways. Horses for courses.
I'm quite happy, in general, with my RadarBox and wouldn't consider a jump in the other direction. However, for all it's advertised merits it still has a way to go.
The other big difference in RadarBox's favour, is the apparent willingness of the developers to consider refining the way in which the software operates, and even if they don't get it right first time, the development continues, largely steered by those of us who use it.
Which DOES make it a completely different animal...
DC