In terms of how I do it, if it looks too wispy to constitute a bud - it goes in the trim/larf/popcorn bowl for edibles, squish, etc. I weigh it all.
There seems to be significant disagreement on how they develop. For instance, IIRC
@Mañ'O'Green observers that increasing air and light to lower bud sites doesn't necessarily affect bud morphology or trichome development, where others observe something different. FWIW, when I rip a bowl of popcorn (assuming decent cure) I really don't see much of a difference in potency if at all.
Some grows you get nearly all buds, some it's more of a mix like on
@indicalla's grow. In my small cab I have hit the max on buds (approx. 5.2 oz) but can get a lot of popcorn depending on the cultivar, the space, and the grow. HTH, YMMV, IMHO, etc.