If you use very fine green teas that can be infused to a densely velvety and savory liquor that still isn’t overly bitter or astringent, 120 ml pots can be used to prepare the green tea version of fine expresso. Otherwise use a slightly larger pot for normal strength that allows you to drink in larger cups.
Generally 120ml (or smaller) pots are for preparing tea that can be drunk in smaller portion and satisfyingly more concentrated.
Lower density Yixing has the ability to mellow down over-fire, astringency, and bitterness in tea. Higher density Yixing enhances sharpness and accents. Both smooth the body.
The round (almost spherical) body is the classic. It is the most versatile shape of all.
If this is not giving you good enough hints, let me know.
