Those two series are messed up beyond words and both of them also feature a dose of black humor. In both the female lead (or at least one of them) does whatever she wants and causes others' lives to be miserable in the process and let us not forget the other pitiful misfits present to witness or participate in her actions (when they are not her victims that is). If you somehow enjoyed one, you can't go wrong with the other. On the other hand if you didn't like one, do yourself a favor and stay as far away as you can from the other one.