When using Site Content and Structure to copy/move list items to a new list within the same site, which method is best. Will I receive different results if I select copy vs move?

Background and Previous Steps:
The customer would like to move items from a custom list to a Task list to receive alerts when tasks are assigned.
I create a new task list, created new columns based on the custom list. Then used Site Content and Structure to copy items to the target list. As a result, the target (Task list) had duplicate column names, missing data and no views where copied over.