
what I'm seen is all the skills that make CNJ good are stuff you get after you can take on WHM(or 2 level before in the case of raise). which means, after you get jobs sure, CNJ(aka WHM) is the ideal healer. but for the first 28-30 levels ARC wins hands down. they essentially add a fifth to the party(carbuncle) who can tank with ease. they can add Dot damage, and they can keep the party all healed up and never run out of MP thanks to Aether flow. alright, so you lose AoE healing, but I havenever found a fight (up through level 22) that couldn't be solved easily with single target healing.
Edit: Also, at level (35?) when ACN can become SCH they will get healing spells (both single target and AoE) that not only heal but negate damage equal to the amount healed.(so kind of double heal, sort of)
Edit: Also, at level (35?) when ACN can become SCH they will get healing spells (both single target and AoE) that not only heal but negate damage equal to the amount healed.(so kind of double heal, sort of)