There is NO such thing as herbal better than pharmaceutical or pharmaceutical better than Herbal.
If a drug has an antiparasitic effect, it must has an MIC ( Minimum inhibition concentration) to kill the germs ( worm or protozoa). Weither the drug is from plant or a synthetized drug.
Here some exemple, Quinin is CONSIDERED A PHARMACEUTICAL DRUG despite the fact that it was extracted from a plant.
Artemisnin is considered a pharmaceutical drug despite the fact that it was extracted from a plant.
The only way to know if the drug is good or not is if it was tested on pathogens. Then you can see if it works at which MIC. Mm or Nno Mm.