The best option for healing the widest variety of diseases among the types of stem cells listed would be embryonic stem cells.
Embryonic stem cells are pluripotent, meaning they have the potential to differentiate into any cell type in the body, which allows for the possibility of treating a broad range of conditions and injuries. In contrast, other types of stem cells, such as bone marrow, skin, and small intestine stem cells, are more specialized and generally limited to specific tissue types or functions.