Neither in my opinion..I have used both in the past. My CRS didn't go crazy about the Mosura so I stopped it after the first bottle. They did like Shirakura better, but I only saw population explosion (I have over 200 babies at this moment) after I started using Hikari Algae Wafers. My killer snails (Anentoma Helena) in the same tank love it too and reproduce like rabbits. I don't know if any other parapameters contributed to the population explosion, but it is certain that algae wafers will do.. the job as far as nutrition is concerned...And it is soooo much cheaper after all..