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What is the commonly used contact type in stamping analysis?

In LSDYNA, there are many choices for contact. What is the commonly used contact type in stamping analysis?

The commonly used contact type for stamping analysis is the FORMING contact. In this contact, the thickness of the rigid tool is disregarded, and many stamping specific features are implemented including the look ahead adaptivity. There are two contacts which belong to this category. Of the two contacts, the most commonly used one is *CONTACT_FORMING_ONE_WAY_SURFACE_TO_SURFACE

When the mesh for the master side is finer than the mesh for the slave side, there will be significant penetration of the blank into the rigid tools. When this condition exists it is better to use the following contact type, even though it is more costly. *CONTACT_FORMING_SURFACE_TO_SURFACE. With this contact, both sides of the contact will be treated equally.