What is the difference in installation convenience between the common mode inductance of toroidal cores and EI-type cores?

The toroidal core has no air gap and high effective permeability, but it requires a dedicated winding machine or manual winding, which leads to a higher cost per piece. During installation, there may be certain difficulties in wiring and other aspects, and it is not very convenient for integration with other components. The EI-type core can be wound using a bobbin, which is fast and economical. During installation, it is easy to layout and integrate with other components on the circuit board, and the fixation is relatively convenient. However, there is an air gap between the two halves, which reduces the effective permeability by about 30%.