I believe its more useful at the bottom as users will decide to go to the next page when they didn’t find what they were looking for.
But i’ve also observed (in e-commerce user tests) users wanting to go the next screen right away. This is when they assume what they are looking for isn’t in the current screen based on what they seen on the 1st few rows. This could happen when there’s too many similar products in a catalog. In this case having a pagination on top can be quite useful.
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