The section tool will give you a live section (always updates unless you set it to manual) and the elements will still be the original 3D elements.
You can manipulate the heights and widths of a section so you can achieve the same view as a detail.
The detail tool will give you a fixed view converting all 3D elements into 2D lines and fills.
You have to manually update a detail if your model changes.
So it just depends what you want.
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