Margin or Padding

[durangod]

I know literally the difference between margin and padding, but sometimes there is a very thin line between the two.   I think this is one of those cases.  In this case is it my preference or is there still a clear cut rule.  See image...   Either way when the select width changes per file name the image is going to move in response.

https://photos.app.goo.gl/Sch1JuQLvhYbcNvNA