Following andrastewhite's cajoling, I also watched the first two episodes of Carnivale.

Yay! It's nice to have pimped something to you for a change *g*.

The set up of Ben and Justin both supernaturally gifted would point to Ben being the warrior for good and Justin the one for evil mentioned in the prologue, but I appreciate the show doesn't seem to make it that simple, by giving Justin good intentions and Ben a more than reluctant nature and severe hang-ups.

As buffyannotator says above, it continues to be complicated even once we know who's 'good' and who's 'evil'. And I use the inverted commas for a reason, because the more we found out about the previous generation, the more I wondered ...