I don't really have a best friend, just a "higher" friend in whatever social group I'm a part of. 2 of them are INFJ and one of them is INTJ.
One of them is probably the person in my life who understands me more comprehensively, and we mostly only talk online now after moving to different cities, she is pretty emotionally stable and has a pretty amazing understanding of her own boundaries, she was my friend for years while I was basically a self obsessed child and is patient as fuck. We've never really had fights or things we majorly disagree with, but I think thats her own doing. Our main interaction difficulty is that she is a big fan of passivity and being non-confrontational with problems, and I feel that leads to a lot of passive aggressive behavior and resentment. On my end I am just more direct and value driven, and I see things are more discreet and black and white.
Another dude is a cool social worker dude way older than me, probably respect him the most out of my friends, although hes rift with all kinds of flaws. We share most of the same values so I think we at least are understood. Feel like I get a lot out of the friendship though and its pretty one sided, but more of a big brother thing than a mentor dynamic. Main contentions are just me being not especially mature relatively and being much more egocentric than he is. He's been a big influence on my value development this year via example, and helped me structure a model of consistency.
Other friend is basically "the" typical intj, with all of their stereotypes magnified hugely. We're kind of foils, in that I've explored myself emotionally much more than he has, but he's pursued a very career driven straightforeward plan his entire life. We understand eachother fine, and our different focuses lead to a lot of interesting discussions since we "specialized".
With all my friends (especially close friends) I go through a idealization period before coming to terms with how flawed literally everyone is. But I think when I come to that point I can finally be a good friend in tern by not expecting them to always know what they're doing. I don't intentionally defer to others decisions, but I do find my opinions very easily chipped away if someone I respect disagrees.
Overlaps between all of them, appreciation of subtle stuff, verbal and nonverbal, working models on how to consistently engage with emotions, all very much not neurotical.