I see the Oath of the Ancients as a champion of the natural world; he;d probably be a lot more open about natural human behavior, like carousin', dancin', and casual romancin'.
Honestly, when I read the paladin descriptons, I see them this way;
Devotion: Monotheistic, Monastic outlook of their service. Very strict and regimented in their personal lives. Lots of self-denial as a moral/ disciplinary exercise while working for the greater good. Basically a questing Templar type who would rather read theology tracts and do calisthenics in his free time.
Ancients: Pagan, Organic, Life-affirming outlook. Very open to things that are considered good, fun, natural. Not a lot of self denial. They indulge in all that is good, and defend all that is good. I'm picturing a pagan dark age, Celtic-ish champion. Flowers in the hair, music in his ear, maids on his lap, until it's time to smite monster that threatens the village.
Vengeance; Unwaveringly strict, Active, Life-denying outlook. No time for frivolities, no interest in fun or love. Complete self-denial as a rule; perhaps a distrust of pleasure at his core. Basically an Witch-Hunter or Inquisitor, obsessed with the idea of finding and destroying the enemies of his faith.
Given my love of dark ales and saucy wenches, I definitely gravitate towards the Ancients.
