I have been asked which boards are the most popular / sold / trendy amongst makers.
I would
love to know the background for being interested in the answer to that question.
You see, I do not believe the answer to the stated question is the correct answer to the underlying unstated question (of which I can think of several different ones), because the popularity and trends have a historical basis.
For example, if one wants to enter the same market, copying the market leader is not a commercially viable approach.
If one wants to teach youngsters to tinker, choosing the device based on popularity or market share instead of fitness for purpose is just idiotic. (Literally, like eating human excrement, because after all, billions of flies cannot be wrong.)
If one represents a large nonprofit organization intending to inject lots of funds with the intent of helping say tech development in developing countries, then one should start working at the
local level, looking for existing local organizations to fund; because funding the already most popular device or platform will have very little impact on anywhere (except to people who get their salaries from companies producing that exact product).
If it is just idle curiosity, nevermind.