..so many strains, not even mentioning the dry/cure periods, it's proving difficult. but im attempting!
Its preference. Dont let some picture tell you when to pull them. Its best to understand the difference between clear/cloudy/amber trichs and how they affect the way THC is metabolized in the body.
Clear trichs generally have a higher percentage of THCV which gives a very clear headed high, but too much can cause anxiety and paranoia.
Cloudy Trichs have the peak amount of THC. Pulling the plant when all the trichs are cloudy will give you the most potent herb from the strain.
Amber Trichs have the highest CBN and CBD percentage. These cannabinoids counterbalance THC by reducing the potency, but increasing the duration of the high, as well as, mellowing the high. It all depends on the strain but some strains, especially indica's, do better with more amber trichs as it will counterbalance the anxiety and racey-ness. Understand that CBD and CBN act as a depressant in the body. If you want a more mellow, stoney effect pick you plant when you have 10-25% amber trichs.
Generally you want sativas when you have majority cloudy trichs, with the occasional clear and amber to counterbalance the high. If you have an indica dominanat strain on hand its best to wait for those amber trichs to start popping up.
Thats my 2 cents.