No formula Im aware of.
You just grow them out and the ones you love you keep.
I have grown the same things and they were shit the first time or two then I figured out what the plant wanted and it was way different.
So for me the hardest part of selection is making sure Im not the problem.
But some stuff has a shitty structure that I don't like to grow, some of it is a pain to trim, some yields great but potency sucks.
Pay attention and you will figure out what you like and dislike.