CFD-Post : Difference of Streamline's sampling


I am sorry if this might be a repeated question, but I could not find an answer that can explain this.

But, I would like to ask, what is the "sampling" option for the streamline plotting in CFD-post? If it's possible can any of you explain the difference of all options and which one might be the best on certain conditions?

Thank you! *references picture below*

< using face >

< using vertex >

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