I'm new to all of this personality-typing, though I have been reading about it for a few months now and have some questions regarding dualities. I understand that it seems to be more of a subjective topic in the personality-typing community (some swearing by it and others writing it off). But my question is in regards to the INTJ-ESFJ duality. I am an ESFJ and have read on certain sites that this duality (INTJ-ESFJ) is considered the "strongest" duality of them all. Is there any particular reason for this? Also, how is this duality exhibited in friendships (it seems everything I read is in regards to romantic relationships)? Interested in hearing your thoughts...