Vertical Rhythm question

Good afternoon folks, I just have a quick question about vertical rhythm. DO you use 16 or 18 as the default font size and what modular scale do you guys use??

Maybe this helps? https://grtcalculator.com/

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Hi Sir, thank you for this, I saw below the vertical spacing units and was wondering if I choose one of them lets say to have space between a header and a paragraph, would I use margin below??? Please answer Im dying to know