What are the pros and cons of different types of galvanic isolations?

Galvanic isolation means the method to isolate systems electrically that operate within different potentials. There are various methods to accomplish this like optical-insulation, capacitive-insulation, magnetic-insulation, and mechanical-insulation. 
The table below shows the comparison among the insulation methods. Digital isolators have some weaknesses in the external magnetic field or CMTI. However, Toshiba supplies products with robust properties against external magnetic fields by utilizing a unique isolation transformer circuit.

For Standard Digital Isolator products, please refer to the following links.