I've read SJs are most common. Do you think it's the most obvious choice from an evolutionary standpoint, thereby causing its prevalence?
Naturally, such a statement would assume that at least some aspect of type is genetic. But even if you feel that type is entirely nurture with no nature, which type would you ascribe, I suppose, to the evolutionary progress of our collective species?
Hell, what is the predilection of OTHER species, if you want to speculate?