I've never used BC-2, but judging alone from the description of this product and their little "aggressiveness" scale that they show for everything, I would agree that Scratch-X is probably slightly stronger.
I have no idea if this is a glaze or a combo glaze/polish product, but I think BC-2 was meant to be the last step before wax, so I would use Scratch-X (or whatever) until I got all the swirls out, and then finish with BC-2 and wax.