Del covered a few, but there are many features of RB that make it different.
My suggestion: try it and see.

Example:
Highlight a part of a single track and regenerate just that section.
Also RB seems to be easier to add a track from a different style or change a track ...
What if I want a Motown type sax solo in my 'X' style song instead of what that style generated? <grin>
That can be done in Biab, just seems more intuitive to me in RB.

Most features are found in a right-click menu for any track.

I do not work here, but the benefits are still awesome
Make your sound your own!