First reaction is that none of the five would have made my cut list in the first place.
Maybe Ancestral Barbarian and/or Favoured Soul Sorcerer.
Ok, more detailed responses:
Ancestral Barbarian: should it be clarified whether the enemies are aware of this effect? In other words, will it tend to cause enemies to change targets to the barbarian? I'm coming around to this sub-class, actually.
Arcane Archer: I'd rather see many more uses of Arcane Arrow, but remove the bonus damage component. MOAR DAMAGE!!!! is boring design.
Kensai: Ever since the original UA I've thought this is a dumb class. Really it should be the Katana class because the "concept" (if you can call it that) is that it's "just better in every way!".
Favoured Soul Sorcerer: I take back what I said above. This doesn't make the cut. I could actually see a whole new "Divine Sorcerer" class, but trying to shoehorn it in as a sub-class of Sorcerer feels awkward.
