I find that both of them are excellent sources in information and knowledge.
I have used both of their suggestions in the past.
I think that with Dr. Clark's liver cleanses, one will see what is removed from the liver and gall bladder. With Dr. Schulze 's liver cleanse program I have not seen any stones, but I still think his stuff is effective.

I did a liver and gall bladder cleanse about six weeks ago. I used a combination of both. I made Dr. Schulze 's Five Day L/GB flush drink five days in a row. Plus I drank two cups of his Detox Tea with one dropper full of his D-Tox tincture and two droppers full of his L/GB tincture added to each cup of tea. I also use his Superfood daily. I would use the Clark type Zapper in the evening for the five days. I then made the Epsom Salt drink and the olive oil and fresh grapefruit
juice that Dr. Clark recommends. I followed her instructions. I did not have any nausea that evening or the next morning. I took the Ornithine capsules and slept like a log. The next morning I finished the rest of the Epsom Salt drink. Since this was my sixth cleanse I did not pass many stones as I have in the past, but I did pass a fair bit of them. I think I did well using both of the Doctors recommendations.

A suggestion for those who have trouble with Dr. Clarks protocol thinking it may be to harsh, I would recommend doing Dr. Schulze 's program. His program may not be as harsh but if done correctly, it should be as effective as Dr. Clark's. He has ready made tinctures and teas for the liver and gallbladder and a tea for the kidneys. His K/B tea (kidney/bladder) has a lot of the ingredients that Dr. Clark has for her recommended kidney cleanse tea. The D-Tox tea has a lot of herbs for both the liver and kidneys plus some herbs for killing parasites. If you only can afford one his products I would recommend trying his D-Tox tea. I find his teas to be easier to make. Everything is in the one package. His Liver/Gall Bladder tincture is an anti parasite formula.
I use Dr. Schulze's products more for maintenance along with the zapper.

Try to read as many of Dr. Clarks book as you can afford. There is a lot more information in them that is not on this web site. Also get as much reading material from Dr. Schulze as possible. If you buy one of his products, you will be on his mailing list for his free newsletters.

I hope this helps. Good luck in your efforts to better health.