I think the general prevalence of each stacking is kind of a pointless and moot point.

However, the prevalence of each stacking in one's own circle of acquaintances & friends is a bit more meaningful.

From the feel i've gotten thus far of the various stackings, I've run across people of pretty much every stacking, except maybe sx/sp.

I think among my closest friends whom i feel most comfortable with, the most represented stackings are probably sp/so and so/sx. If my understanding is correct, I dont find sp/so all that business-like, but rather low-key, fluffy, friendly, humble...normal. Maybe to an sx/so they might seem cold and business like though . I guess it's all in the perspective. I personally find the sx-first lifestyle too wild... I couldn't keep up with it and wouldn't want to.