Since i dont have any angel besides Erun or Niel i leveled erun and AWed her and since then am using her in my core team most the time. Just her passive healing by being on the field is great (especialy with farne) and her stats are brute for her low cost. If i get the chance to min cost her id defenitly do so. Hell erun at the cost of Katie? Wow for sure.

As for that princess im not too sure... maybe on maps that have no UP problems and are realy hard to beat her passive may give the edge my grace/anya/shizuka need to tank.