Brandish and Final Attack

It doesn't look like much of a difference either way, so it's really a question of do you like having FA or not. Personally I've always hated any type of FA on any character because it reduces the amount of control you have over your character. You can't decide exactly when to stop attacking one monster and move onto the other. It's really annoying and if the benefit to having it isn't large enough I wouldn't bother getting it at all.