I did a review of both for Liberator on Toy Time. Here's the Black Label informational
Here's the wedge/ramp combo
The Black label as Lucky 21 said is perfect if you are into playful restraint! It raises you up off any surface by 9 inches and has a flat surface with the added bolsters. It doesn't give you the lift through the hips that the wedge ramp combo does. There are many more position options with the wedge/ramp combo. However, you made a good point in buying the wedge to add to the stage. That would give you many more options and a lot more coverage! Good luck and have fun!!