What is the best way to hang when drying

What is the best way to hang the plant for drying? Hang the whole plant upsidedown, or just the bud branches?

just the bud branches, less water to evaporate.

I have been searching and have found nothing. I am looking for a thread or some pictures that show how they are being hung and how they are cleaned before hanging.

Is there a reason why we hang out plants upside down or is it just because its easier to hang that way?