If you are wondering what the difference is between soft-cups and moon cups and wondering which one you should use then there are a few things that you need to know. Firstly both items are designed to catch your menstrual flow but are slightly different shapes. Now as we are all designed differently ourselves, it may depend on your body as to which of soft cups or moon cups will work better for you, so it may be a case of having to try them both out.
One main difference between the softcup v the mooncup is that soft-cups are designed to be used only once (although it may be possible to reuse them if you are careful) and mooncups are designed to be reused. This may make the mooncup slightly more affordable in the long run.
You can also buy different size mooncup depending on age and if you have given birth vaginally. (Size A is for those who have not given birth vaginally essentially and size B is for those who have, or those who are over 30).
The mooncup is made of soft silicone rubber but overall is a more solid design than the soft-cups. Soft-cups have a rubber ring with a plastic style collection area for the menstrual blood.
So in order to choose which one you may need to try them both. If you are planning to use them to help you conceive then the soft-cup is definitely better as it holds the sperm right under the cervix.