I cannot voice an opinion on the leghorn or white rock because I do not have either. I really love my SLW and Ameraucana (I think is an EE). The light brahma is a sweetie but can be a bully as she is head honcho. My NHR is not mean but not overly friendly...a bit shy. My BAs are both sweet and one is very friendly and even acting motherly to the 7 week olds.
Out of my new crew of 21...they are all friendly. Golden Buffs, Cochins, Partridge Rock and the absolute sweetest is on Ameraucana and the Dominique.
Good luck keeping just 10. I wanted only 6 and got them, then got 5 more BAs and just got 21 more. hahahaha