up to you, really. eventually, Horus will be a harder hitting but slower attacking magic fencer as opposed to charlotte. and horus's skill will add more atk, with a longer duration, but it will take longer before it can be reused. personally, I'm going more for Horus than charlotte, even though I already got charlotte to 50cc42 full aff. (at least when I have time to level and aff horus)