After seeing all the Confidants, I can say that Makoto is the definitive choice. The pre Palace 4 stuff sealed the deal for me.
Also, I really can't go after Becky. The whole affair seems totally immoral and despite her story, she is essentially a gold digger...
I don't know much about her, but the idea of dating your teacher, while hot AF in this fictional setting, is super unprofessional IRL, so it's a bit of a turn off for me.