That's very hard to say; but I'll share my experience
I have taken Gold Coin Grass, Chinese Bitters, Coptis, Curcuma, etc....(not all at once!). But over time.
I do think that Gold Coin Grass is superior to anything out there, even malic acid, in breaking down stones. However, I do think that malic acid in apple cider vinegar works awesome as well, but not as QUICKLY as GCG does.
I have turned into a huge proponent of peppermint oil for bile flow. I took Coptis for many months but people started raving about peppermint oil and I got some and found that as little as 5-6 drops per day under the tongue was amazing for bile flow; just as good if not better than Coptis and a small fraction of the price.
Lecithin seems to virtually keep me stone free. I'm a huge proponent of it!!!
I guess I found that the aforementioned herbs were fantastic while I was flushing. However, now that I'm stone free, peppermint oil and lecithin seem to do the job at keeping me that way.
So to summarize, I think that GCG is the way to go if you are seriously trying to break stones down, along with apple cider vinegar (Bragg's only, of course). Peppermint oil in place of Coptis (that's NOT the extract in the baking section btw!), and lecithin in place of all those other vitamins (not that there's anything wrong with all those supplements, but that can be very expensive for the average person to maintain over a long time!) should do the trick for the average person imho.