so/sx is the lightest, most anxious, most self-deprecating, and best at immediately giving everyone around the feeling of belonging to the group and being personally recognized at the same time. i really like so/sx types. i think a lot of so/sp types mistype as so/sx. so/sx types have the most natural charm, i think, whereas sx/so types have the most powerful, i'm gonna go get what i want charisma. so/sx types can seem flighty or spread out too thin, and i think they at times don't really know how to take care of their needs that don't at all fit in with the group. they're much more likely to try to work on the group then to work outside of it, because their skills are better suited towards that kind of changing the whole tone/tenor of the group attitude majority vote. so/sp types by contrast are a bit sterner, more deliberate, and more focused on personal accountability, personal distance/being given appropriate space, privacy, and freedom from having too much demanded of them by others.
sp/so is a bit different, it's more insulated but very warm, provides a softening quality to the whole ego complex, looking for a select few allies, a sense of belonging to a group but mostly relying on the freedom to be personally responsible for whatever happens, to not have to rely on others, to be free/not have to deal with them all the time and to instead be more self-reliant. kind of as a mode of protection. the sp/so types i know enjoy the presence of others, but they don't want direct engagement a lot of the time, they just want to be there together.