I've used both extensively for many years and both are quite effective. The only thing I do find variations in smells but I would attribute that small fluctuation from batch to batch to be quite normal. On the other hand, there are no eo's that I would ingest that are not from YL. I had a bad experience with a few that were not YL and since have not ingested any that were not YL. However, I do use AC and others frequently. The price difference is something to consider when using them because YL's do tend to be a bit pricey. Fair is fair though, perhaps there are others out there that used them as teas and didn't have any reactions. JM2cents