I mostly prefer Selene. (Content prior to Coil, was not there yet)
Her Buffs improve the whole party damage, so fights are over faster. Sure, I need to do more healing myself... but duh I am a healer. And contributing to DPS is better done by improving the whole party output first. Sure, if I dont have to heal that much I also contribute to damage myself... but its always smarter to give Tank and DPS an edge to their damage first.
I only use Eos in healing-intense battles depending on the group setup and gear-status.
