My best friend(s) have either been ESI or xEE.

I've also been closer friends with SEI and ESE girls, and to some extent one or two EII girls. The friendship with the latter is sometimes not as easy to start and usually fizzles out eventually. When there are no shared (NF) interests with Delta NFs, there is nothing that "holds" me to them. Whereas with SF types, it is either the Se or Fe that connects me to them; having the exact same interests is not as paramount (but surely helps).

I have never been friends with an NT girl before. This could boil down to them being more rare (especially the Ni kind). Alpha NTs have always seemed rather dorky to me. Not necessarily in a bad way, but in a way that did not make me feel compelled to become friends with them. I don't remember having known any female Gamma NTs irl, actually. If I have, I certainly have not become friends with one, because I usually figure out my friends' types.