oh, dear god! not this again!
Where do you find yourself posting more? SP, NT or INTPC?
Where's the most commonality?
S or N for me was as simple as being asked to describe a cup.
An S will tell you what the cup looks like, maybe it's physical dimensions...color attributes.
An N will go off on some tanget of something the cup reminds them of.
Often time their responses are somewhere out in left field vs. an S.