I am pretty much done with vamp side of the dlc now going through the dawnguard side and I already noticed I missed a couple dialogue options with serana on my vamp playthrough. Also I noticed since having done them on my dawnguard playthrough she seems to make a lot more comments and seem genuinely happier around me. So does exhausting every dialogue option that there is a chance to get actually make her like you more at the end of dlc or change outcomes in some miniscule way?
I ask because if so I'm restarting my vamp playthrough. Just glad I kept save prior to dlc.