I checked other studies to see what others say (and eventually conform myself to others) I found studies excluding gender in conformity studies. Based on that, I remain open to say it may be a bias, a definition problem, or erroneous conclusions based on biased observations I had.

I wouldn't frame it in a negative way, and I would avoid the term "choice" because we do not necessarily make rational choices, this is why I used the word behavior, particularly for groupthink. By the way is groupthink really the use of thought in a group, so is there a choice? Or could we characterize groupthink as an instinctive rally to a group?

So bottom line, I would tend to see women as behaving differently for biological reasons. Not inferior, nor superior, but tending to behave in a group differently than men. Am I wrong by stating that this impacts also conformity? According to some studies I checked earlier yes, however there could be multiple factors, like social, cultural, etc. This could explain why experimentally I saw differences between men and women during the period when people were wearing masks for example (using the word "experimentally" may be pompous since it is just observations based on everyday life).