As a Mother and an Enema user myself. I tend to have the feeling that Home Made are a lot better then The store Brand. I have been on both sides and seen the results of both. I find that using Store brands or both tend to not work as well as Homemade and gives you more cramps. I think a lot of the cramps are because of the chemicals they add into them. Where when you make them from scratch you know how much is the right amount to use. Each and every one are different to how strong or weak they want them. When buying pre-made you don't how much of ingredients are used.
If you allergies to certain ingredients that you may not know is in store brand suppositories and enemas you could have a serious reaction. Where if you make them Home Made you know the ingredients you are putting in your body. Hospital tend to go for the easy way out due to time and work load.
I have seen the results of both Home Made and pre-made. I tend to find the chemical one more harsh and more cramps. I Love using Dr Bonner's Lavender or Peppermint with Ivory Soap for the best results. I use a 4 qt bag for myself and on my son I use a bulb syringe.