Flexbox - What is the best way to set the margin from the edge of the container?

Question

css

Google did not give an answer (maybe I did not search well).
I have a flex container with n flex items.
I need to set the padding from the edge of the container with one value, and between the elements - the padding with a different value.
I found 2 ways, but I don’t know which of these methods is still correct (and which are underwater for each method).
Code examples below:
https://jsfiddle.net/vgoejckd/ (padding set using padding on container)
https://jsfiddle.net/qzvje0uf/ (padding set using margin on elements)

Answer 1

https://jsfiddle.net/7qjs4bgd/