In using Arc's Project Tool my Input Feature Class is in the "WGS_1984_Web_Mercator_Auxillary_Sphere" coordinate system. Once I set the desired "Output Coordinate System" to "GCS_North_American_1983_CSRS" the tool auto-completed the "Geographic Transformation" field to:


But I notice there are other options in the dropdown, most notably:


What is the difference between these two apparent verions (1 & 2) of transformation?


ESRI has a help article on this topic.

This picture is taken directly from that article:

Overview of transformation applications from ESRI article linked above.

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