Chocobo Companions and You: A Guide

[AylaYukihana]

I consider it useful, but not as useful as a powerful attack or an extra +15% Critical Hit chance

Its not Atk/Slow versus Atk/Dot AND 15% crit chance, its just slow vs dot, because you can get rank 6 on defender to get 15% crit as well. 7 Healer, 6 Defender, 3 Attack, yields 30% crit boost, 3 WS and potent healing, the only difference is DoT WS or Slow WS.